Middle School Math Glossary
291 cards by A.cheng created on 2014/01/06

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1
absolute value
Examples
Answer
 the absolute value of a number is the distance between the number and 0 on a number line
Explanation

2
acute angles
Examples
Answer
 An angle whose less than 90 degrees.
Explanation

3
acute triangle
Examples
Answer
 a triangle with 3 acute angles (less than 90 degrees)
Explanation

4
addition property of equality
Examples
Answer
 Adding the same number to each side of an equation produces an equivalent equatoin.
Explanation

5
additive identity
Examples
Answer
 a number such that when you add it to a seconed number, the sum is the second number
Explanation

6
additive inverse
Examples
Answer
 a+a=0 (where you add a number and its opposite and it equals zero)
Explanation

7
adjacent angles
Examples
Answer
 Two angles that a common side, and a vertex, and do not overlap
Explanation

8
algebraic expression
Examples
Answer
 A mathematical phrase involving at least one variable and sometimes numbers and operation symbols.
Explanation

9
angle
Examples
Answer
 Formed by two rays that have the same endpoints
Explanation

10
angle of rotation
Examples
Answer
 angle formed by rays drawn from the center of rotation to a point and its image
Explanation

11
annual interest rate
Examples
Answer
 the percent of the principal you pay or earn a year
Explanation

12
arc
Examples
Answer
 part of a circle
Explanation

13
area
Examples
Answer
 The amount of surface enclosed by a figure measured in square units
Explanation

14
associative property of addition
Examples
Answer
 Changing the grouping of the addends does not change the sum
Explanation

15
associative property of multiplication
Examples
Answer
 changing the grouping of factors will not change the product
Explanation

16
average
Examples
Answer
 A single number that can represent all other values in a data set.
Explanation

17
axes
Examples
Answer
 the vertical line along the left side of the graph and the horizontal line along the bottom
Explanation

18
balance
Examples
Answer
 The principal plus the interest earned.
Explanation

19
bar graph
Examples
Answer
 in a bar graph, the lengths of the bars represent the data
Explanation

20
base of a parallelogram
Examples
Answer
 any side of a parallelogram
Explanation

21
base of a power
Examples
Answer
 the number or expression used as a factor in a repeated multiplication
Explanation

22
base of a solid
Examples
Answer
 Prism, cylinder, pyramid and cone
Explanation

23
base of a triangle
Examples
Answer
 the length of any of its sides
Explanation

24
base of a trapezoid
Examples
Answer
 one of the two parallel sides of the trapezoid
Explanation

25
benchmark
Examples
Answer
 a point of reference from which other measurements may be estimated of the unit
Explanation

26
biased sample
Examples
Answer
 Individuals or groups from a population are not represented in a sample.
Explanation

27
binomial
Examples
Answer
 a polynomial with two terms
Explanation

28
bisector of an angle
Examples
Answer
 the ray that divides the angle into two congruent adjacent angles
Explanation

29
box and whisker plot
Examples
Answer
 A graph that summarizes data along a number line using quartiles
Explanation

30
capacity
Examples
Answer
 the amount that can be contained
Explanation

31
center of a circle
Examples
Answer
 the point inside a circle that is the same distance from all the point on the circle
Explanation

32
center of rotation
Examples
Answer
 the point about which a figure is rotated
Explanation

33
circle
Examples
Answer
 the set of all points in a plane that are the same distance, called the radius, from a fixed point, called the center
Explanation

34
circle Graph
Examples
Answer
 A graph of data where the entire circle represents the whole or 100%
Explanation

35
circumference
Examples
Answer
 The distance around a circle
Explanation

36
clustering
Examples
Answer
 An estimation method in which a group of numbers close in value are rounded to the same Value.
Explanation

37
coefficient
Examples
Answer
 The numerical factor of a term that contains a variable.
Explanation

38
combination
Examples
Answer
 the act of combining things to form a new whole
Explanation

39
common factor
Examples
Answer
 a whole number that is a factor of two or more nonzro whole numbers
Explanation

40
common multiple
Examples
Answer
 an integer that is a multiple of two or more other integers
Explanation

41
commutative property of addition
Examples
Answer
 In a sum, you can add terms in any order
Explanation

42
commutative property of multiplication
Examples
Answer
 In a product, you can multiply terms in any order
Explanation

43
compatible numbers
Examples
Answer
 Numbers that make a calculation easier
Explanation

44
complement
Examples
Answer
 The set of all elements that are universal set /U/ that are not in set /A/, Written as ~A
Explanation

45
complementary angles
Examples
Answer
 2 angles whose sum adds to 90°
Explanation

46
complementary events
Examples
Answer
 Events that have no outcomes in common and that together contain all the outcomes of the experiment
Explanation

47
composite number
Examples
Answer
 whole number that has factors other than itself and 1
Explanation

48
compound interest
Examples
Answer
 interest calculated on both the principal and the accrued interest
Explanation

49
computation
Examples
Answer
 To perform operation to find an amount. A computation can also be the result of the operations
Explanation

50
cone
Examples
Answer
 a solid figure with one circular base and one vertex
Explanation

51
congruent angles
Examples
Answer
 Angles that have the same measure
Explanation

52
ocngruent polygons
Examples
Answer
 2 polygons that are exactly the same size and shapeeach corresponding side must be congruent and corresponding angles must be congruent
Explanation

53
congruent segments
Examples
Answer
 Segments that have the same length
Explanation

54
congruent triangles
Examples
Answer
 sides that have the same length
Explanation

55
constant term
Examples
Answer
 a term taht has a number but no variable
Explanation

56
converse
Examples
Answer
 the statement formed by switching the hypothesis and conclusion of a conditional statement
Explanation

57
coordinate grid
Examples
Answer
 a grid formed by a hirizontal line called the xaxis and the yaxis
Explanation

58
coordinate plane
Examples
Answer
 A coordinate system formed by the intersection of a horizontal number line, called the xaxis, and a vertical number line, called the yaxis.
Explanation

59
coordinates
Examples
Answer
 Ordered pairs that identify points on a coordinate plane. (x,y)
Explanation

60
corresponding angles
Examples
Answer
 angles that have the same position on 2 different side parralel lines
Explanation

61
corresponding parts
Examples
Answer
 Sides or angles that occupy the same relative positions in similar polygons.
Explanation

62
cosine
Examples
Answer
 ratio of the adjacent side to the hypotenuse of a rightangled triangle
Explanation

63
counting principle
Examples
Answer
 If one event can happen M ways and another event can happen N ways then the two events can happen in MN ways.
Explanation

64
cross products
Examples
Answer
 In a proprtion a/b=c/d, where b is not equal to 0 and d is not equal to zero, the products are ad and bc.
Explanation

65
cross products property
Examples
Answer
 The cross products of a porportion are equal
Explanation

66
cube
Examples
Answer
 a regular soild having six congruent square faces
Explanation

67
cubed
Examples
Answer
 a number to the third power
Explanation

68
cylinder
Examples
Answer
 a solid bounded by a cylindrical surface and two parallel planes (the bases)
Explanation

69
data
Examples
Answer
 facts and statistics gathered for reference or analysis
Explanation

70
decimal
Examples
Answer
 a number that uses place value and a decimal point to show values less thatn one, such as tenths, hundredths, etc.
Explanation

71
degrees
Examples
Answer
 used to measure temperature, latitude, longitude, right ascsension, and declination
Explanation

72
denominator
Examples
Answer
 the divisor of a fraction
Explanation

73
dependent events
Examples
Answer
 The outcome of one event does affect the outcome of the second event
Explanation

74
diagonal
Examples
Answer
 a straight line connecting any two vertices of a polygon that are not adjacent
Explanation

75
diameter of a circle
Examples
Answer
 the distance across the circle through the center
Explanation

76
difference
Examples
Answer
 The amount left after one number is subtracted from another
Explanation

77
digit
Examples
Answer
 Any of the symbols used to write numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
Explanation

78
dilation
Examples
Answer
 A transformation that either enlarges or reduces a figure to make a similar image
Explanation

79
dimension
Examples
Answer
 the measurements of an object's length, width, and height or the overall extent or scope
Explanation

80
direct variation
Examples
Answer
 an equation of the form y=kx, where k does not equal 0
Explanation

81
discount
Examples
Answer
 the act of reducing the selling price of merchandise
Explanation

82
disjoint events
Examples
Answer
 2 or more events with no outcomes in common
Explanation

83
distributive property
Examples
Answer
 Multiplying a sum by a number is the same as multiplying each addend by that number and then adding the two products.
Explanation

84
dividend
Examples
Answer
 a number to be divided by another number
Explanation

85
divisible
Examples
Answer
 A whole number that can divide evenly into another number without a remainder.
Explanation

86
division property of equality
Examples
Answer
 Allows you to divide both sides of an equation by the same nonzero number
Explanation

87
divisor
Examples
Answer
 the number by which a dividend is divided
Explanation

88
domain of a function
Examples
Answer
 The set of all possible input values for the function
Explanation

89
double bar graph
Examples
Answer
 in a double bar graph, there are two sets of data or two bars for each item
Explanation

90
edge of a polyhedron
Examples
Answer
 A line segment where two faces of the polyhedron meet
Explanation

91
edge of a solid
Examples
Answer
 A line segment where two faces of the solid meet
Explanation

92
elapsed time
Examples
Answer
 the time that elapses while some event is occurring
Explanation

93
element
Examples
Answer
 An object in a set
Explanation

94
empty Set
Examples
Answer
 a set that has no elements in it
Explanation

95
endpoint
Examples
Answer
 a point at the end of a segment or ray
Explanation

96
equation
Examples
Answer
 a mathematical statement that two expressions are equal
Explanation

97
equilateral triangle
Examples
Answer
 a triangle with three equal sides
Explanation

98
equivalent equations
Examples
Answer
 equations that have the same solution
Explanation

99
equivalent expressions
Examples
Answer
 Expressions that simplify to an equal value when numbers are substituted for the variables of the expression.
Explanation

100
equivalent fractions
Examples
Answer
 fractions that name the same number
Explanation

101
equivalent inequalities
Examples
Answer
 inequalities that have the same solution
Explanation

102
equivalent ratios
Examples
Answer
 Ratios that have the same value.
Explanation

103
equivalent variable expressions
Examples
Answer
 variable expressions that have the same value for all values of the variable(s)
Explanation

104
estimate
Examples
Answer
 An answer that is close to the exact answer
Explanation

105
evaluate
Examples
Answer
 find out the value or amount of
Explanation

106
evaluating a variable expression
Examples
Answer
 substitute a number for the variable/s and find the value of the resulting numerical experssion
Explanation

107
event
Examples
Answer
 a collection of one or more outcomes
Explanation

108
experimental probability
Examples
Answer
 Probability based on data from repeating an event (doing an experiment)
Explanation

109
exponent
Examples
Answer
 a mathematical notation indicating the number of times a quantity is multiplied by itself
Explanation

110
expression
Examples
Answer
 A mathematical phrase involving at least one variable and sometimes numbers and operation symbols.
Explanation

111
face of a polyhedron
Examples
Answer
 A polygon that is a side of a polyhedron.
Explanation

112
face of a solid
Examples
Answer
 Polygon that is a side of a solid.
Explanation

113
factor
Examples
Answer
 When whole numbers other than zero are multiplied together, each number is a factor of the product.
Explanation

114
factor tree
Examples
Answer
 A diagram showing the prime factors of a number
Explanation

115
factorial
Examples
Answer
 The expression of n!; read n factorial; where n is greater than zero, the product of all positive integers beggining with n count back to 1
Explanation

116
favorable outcomes
Examples
Answer
 The outcomes for the particular event you are considering
Explanation

117
formula
Examples
Answer
 An equaton that relates two or more quantities such as perimeter, length, and width
Explanation

118
fraction
Examples
Answer
 A number that names part of a whole or group.
Explanation

119
frequency
Examples
Answer
 The number of observations in a given statistical category
Explanation

120
frequency table
Examples
Answer
 A table used to group data values into intervals
Explanation

121
frontend estimation
Examples
Answer
 A method of estimating a sum by adding the frontend digits and using the remainingdigits to adjust the sum
Explanation

122
function
Examples
Answer
 A function is a relation where every element in the domain is paired with one and only one element in the range. The domain is a set of all first elements and the range is a set of all second elements.
Explanation

123
fuction notation
Examples
Answer
 An equation that uses f(x) to represent the output of the function f for an output of x.
Explanation

124
graph of an inequality
Examples
Answer
 A graph containing a variable that shows all the solutions that satisfy the inequality.
Explanation

125
greatest common factor
Examples
Answer
 The number that is the greatest common factor of two or more whole numbers.
Explanation

126
grouping symbols
Examples
Answer
 Symbols such as parentheses, brackets, fraction bars
Explanation

127
half plane
Examples
Answer
 The graph of a linear inequality in two variables
Explanation

128
height of a parallelogram
Examples
Answer
 the perpendicular distance between the side whose length is the base and the opposite side
Explanation

129
height of a trapezoid
Examples
Answer
 perpendicular distance between the bases
Explanation

130
height of a triangle
Examples
Answer
 the perpendicular distance between the side whose length is the base and the vertex opposite that side
Explanation

131
heptagon
Examples
Answer
 a polygon with seven sides
Explanation

132
hexagon
Examples
Answer
 A polygon with six angles.
Explanation

133
histogram
Examples
Answer
 a bar graph in which the horizontal scale represents classes of data values and the vertical scale represents frequencies. The heights of the bars correspond to the frequency values and thee bars are drawn adjacent to each other w/o gaps
Explanation

134
horizontal axis
Examples
Answer
 the horizontal line on a graph
Explanation

135
hypotenuse
Examples
Answer
 the side of a right triangle opposite the right angle
Explanation

136
identity property of addition
Examples
Answer
 the sum of any number and 0 is equal to the initial number: symbolic form a+0=a
Explanation

137
identity property of multipilcation
Examples
Answer
 the product of a number and the multipicative identity, 1, is the number
Explanation

138
image
Examples
Answer
 the new figure formed by a transformation
Explanation

139
improper fraction
Examples
Answer
 a fraction whose numerator is larger than the denominator
Explanation

140
independent events
Examples
Answer
 The outcome of one event does not affect the outcome of the second event
Explanation

141
inequality
Examples
Answer
 a sentence that uses symbols
Explanation

142
input
Examples
Answer
 a number in which a function operates. An input value is the domain of the function.
Explanation

143
input output table
Examples
Answer
 one way to describe a function. It lists the inputs and outputs.
Explanation

144
intergers
Examples
Answer
 the numbers....... 4,3,2,1,0,1,2,3,4,.......... consisting of the negative intergers, zero, and the positive intergers
Explanation

145
interest
Examples
Answer
 the amount earned or paid for the use of money
Explanation

146
interquartile range
Examples
Answer
 The difference between the upper and lower quartiles in a box and whisker plot
Explanation

147
intersecting lines
Examples
Answer
 two lines that meet at a point
Explanation

148
intersection of a set
Examples
Answer
 the set of a elements in both set A and B
Explanation

149
inverse operations
Examples
Answer
 operations that "undo" each other
Explanation

150
inverse property of addition
Examples
Answer
 this property states that when a number is subtracted by itself, the result is always zero
Explanation

151
inverse property of multiplication
Examples
Answer
 this property states then when a number is divided by itself or multiplied by its reciprocal, the result is one is
Explanation

152
inverse variation
Examples
Answer
 relationship between two variables in which the product is a constant y=k/x
Explanation

153
irrational numbers
Examples
Answer
 Numbers that cannot be expressed as a ratio of two integers. Their decimal expansions are nonending and nonrepeating.
Explanation

154
isometric drawing
Examples
Answer
 the drawing of a 3d object that shows a corner view of a figure. it is not drawn in perspective and the distances are not distorted.
Explanation

155
isosceles triangle
Examples
Answer
 a triangle with two equal sides
Explanation

156
lateral surface area
Examples
Answer
 The sum of all the areas of the faces of a 3D solid except the bases
Explanation

157
leading digit
Examples
Answer
 the first nonzero digit
Explanation

158
leaf
Examples
Answer
 the last digit on the right of a number displayed in a stemandleaf plot
Explanation

159
least common denominator
Examples
Answer
 The least common multiple of the denominators of the fractions.
Explanation

160
least common multiple
Examples
Answer
 The smallest multiple (other than zero) that two or more numbers have in common.
Explanation

161
legs of a right triangle
Examples
Answer
 two sides os a triangle that form a triangle
Explanation

162
length
Examples
Answer
 distancemeasured using a ruler, units are meters
Explanation

163
like terms
Examples
Answer
 Expressions that contain the same variables to the same power
Explanation

164
line
Examples
Answer
 a straight path that goes in two directions without end
Explanation

165
line graph
Examples
Answer
 A graph that uses line segments to show changes that occur over time
Explanation

166
line of reflection
Examples
Answer
 The line over which a figure is reflected. The vertices of the original and new figure are the same distance from this.
Explanation

167
line of symmetry
Examples
Answer
 a line that divides a figure into two congruent parts
Explanation

168
line plot
Examples
Answer
 a number line diagram that uses X marks to show the frequenciesof items or categories being tallied
Explanation

169
line symmetry
Examples
Answer
 a line through an image so that the two sides are mirror images
Explanation

170
linear equation
Examples
Answer
 in two varibles is an equation in which the varibles is an equation in which the varibles appear in seperate terms & neither varibles conains an exponet other than one
Explanation

171
linear function
Examples
Answer
 a function in which the graph of the solutions forms a line
Explanation

172
linear inequality
Examples
Answer
 an inequality that appear in seperate terms and each variable occurs only to the first power
Explanation

173
lower extreme
Examples
Answer
 The least value in a data set
Explanation

174
lower quartile
Examples
Answer
 The median of the lower half of data set
Explanation

175
mark up
Examples
Answer
 the increase in the wholesale price of an item
Explanation

176
mean
Examples
Answer
 the sum of the values in a data set divided by the number of values
Explanation

177
measure
Examples
Answer
 to find dimensions, quanity, capacity, or weight
Explanation

178
median
Examples
Answer
 The middle number in a set of data when it is arranged in numerical order. If the data set has an even number, the median is the mean of the two middle numbers.
Explanation

179
mixed number
Examples
Answer
 a whole number and a fractional part
Explanation

180
mode
Examples
Answer
 The number seen most often in a list. There can be no mode, one mode or more than one mode.
Explanation

181
monomial
Examples
Answer
 an expression that is a number, a variable, or a product of numbers
Explanation

182
multiple
Examples
Answer
 The product of a whole number and any nonzero whole number
Explanation

183
multiplication property of equality
Examples
Answer
 the property that states that if you multiply both sides of an equation by the same number, the new equation will have the same solution
Explanation

184
multiplication property of zero
Examples
Answer
 anything multiplied by zero is always zero
Explanation

185
multiplicative identity
Examples
Answer
 a number such that when you multiply it by a second number, the product is the second number
Explanation

186
multiplicative inverse
Examples
Answer
 the multiplicative inverse of a number a/b is the number b/a; the product of any nonzero number and its multiplicative inverse is 1. The multiplicative inverse is aslo called the reciprocal.
Explanation

187
negative intergers
Examples
Answer
 a whole number that is less than zero
Explanation

188
net
Examples
Answer
 a two dimensional figure that can be folded to form a solid
Explanation

189
number fact family
Examples
Answer
 four numbers facts consisting of three numbers related by inverse operations
Explanation

190
number line
Examples
Answer
 A line for representing and graphing numbers. Eachpoint on the line corresponds to a number.
Explanation

191
number sentence
Examples
Answer
 a mathematical statement that has numbers, at least one operation sign, and an equal or inequality sign
Explanation

192
numerator
Examples
Answer
 the top number of a fraction. a/b = the numerator is a
Explanation

193
numerical expression
Examples
Answer
 a mathematical expression that has a combination of numbers and at least one operation
Explanation

194
obtuse angle
Examples
Answer
 an angle between 90 and 180 degrees
Explanation

195
obtuse triangle
Examples
Answer
 a triangle with one obtuse angle
Explanation

196
octagon
Examples
Answer
 an eightsided polygon
Explanation

197
odds in favor of an event
Examples
Answer
 The ratio of the number of favorable outcomes to the ratio of the number of unfavorable outcomes.
Explanation

198
opposites
Examples
Answer
 two numbers that are the same distance from zero on a number line, but are in opposite directions. (2 and 2)
Explanation

199
order of operations
Examples
Answer
 The rules to be followed when simplifying expressions. Parentheses, Exponents, Multiply, Divide, Add, Subtract in order from left to right. Please Excuse My Dear Aunt Sally
Explanation

200
ordered pair
Examples
Answer
 A pair of numbers that give the location of a point on a grid.
Explanation

201
origin
Examples
Answer
 the point (0,0)
Explanation

202
outcome
Examples
Answer
 the result of carrying out an experiment
Explanation

203
output
Examples
Answer
 a number produced by evaluating a function using a given input. An output value is in the range of the function
Explanation

204
overlaping events
Examples
Answer
 events that have one or more outcomes in common
Explanation

205
parallel lines
Examples
Answer
 two lines that never meet
Explanation

206
parallelogram
Examples
Answer
 a quadrilateral whose opposite sides are both parallel and equal in length
Explanation

207
pattern
Examples
Answer
 A series of numbers or figures that have a consistent relationship between them
Explanation

208
pentagon
Examples
Answer
 a fivesided polygon
Explanation

209
percent
Examples
Answer
 a ratio whose denominator is 100 and the sign for it is %
Explanation

210
percent equation
Examples
Answer
 you can represent "a is p percent of b" with the equation a=p% times b where a is part of the base b and p% is the percent
Explanation

211
percent of change
Examples
Answer
 a percent that shows how much a quantity has increased or decreased in comparison with the original amount
Explanation

212
percent of decrease
Examples
Answer
 percent of change where the new number is less than the original number
Explanation

213
percent of increase
Examples
Answer
 percent of change where the new number is greater than the original number
Explanation

214
perfect square
Examples
Answer
 a number like 9 that is the square of an integer
Explanation

215
perimeter
Examples
Answer
 the size of something as given by the distance around it
Explanation

216
permutation
Examples
Answer
 an arrangement of objects in which order is important
Explanation

217
perpendicular bisector
Examples
Answer
 a line that is perpendicular to a line segment and intersects the line segment at its midpoint
Explanation

218
perpendicular lines
Examples
Answer
 two lines that meet and form a right angle
Explanation

219
pi
Examples
Answer
 the ratio of the circumference to the diameter of a circle
Explanation

220
pictograph
Examples
Answer
 A graph that shows data by using picture symbols
Explanation

221
place value
Examples
Answer
 The value given to a digit by its place in the number.
Explanation

222
plane
Examples
Answer
 a flat surface that extends without end in all directions.
Explanation

223
point
Examples
Answer
 a position in space represented with a dot
Explanation

224
polygon
Examples
Answer
 a closed plane figure formed by three or more line segments that intersect only at thier endpoints.
Explanation

225
polyhedron
Examples
Answer
 a solid figure bounded by plane polygons or faces
Explanation

226
ploynomial
Examples
Answer
 a monomial or a sum of monomials
Explanation

227
population
Examples
Answer
 in statistics the entire group of people or objects about which you want information.
Explanation

228
positive intergers
Examples
Answer
 a whole number that is greater than zero
Explanation

229
power
Examples
Answer
 a product formed from repeated multipulcation by the same numbers, it contains of a base and an exponent
Explanation

230
preimage
Examples
Answer
 the original figure in the transformation of a figure
Explanation

231
prime factorization
Examples
Answer
 A whole number expressed as the preduct of its prime factors.
Explanation

232
prime number
Examples
Answer
 an integer that has no integral factors but itself and 1
Explanation

233
principal
Examples
Answer
 the amount of money invested or borrowed
Explanation

234
prism
Examples
Answer
 A solid figure with two parallel bases that are congruent polygons
Explanation

235
probability of event
Examples
Answer
 the measure of the likelihood that the event will occur
Explanation

236
product
Examples
Answer
 the answer to a mulitplication problem
Explanation

237
proper fraction
Examples
Answer
 a fraction with a numerator smaller than the denominator
Explanation

238
proportion
Examples
Answer
 An equation starting that two ratios are equivalaent.
Explanation

239
pyramid
Examples
Answer
 a solid figure that has a polygon for a base and triangles for sides
Explanation

240
Pythagorean theorem
Examples
Answer
 States that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the legs.
Explanation

241
Pythagorean triple
Examples
Answer
 a set of three positive intergers
Explanation

242
quadrant
Examples
Answer
 One of four regions of a coordinate system bounded by the xaxis and yaxis
Explanation

243
quadrilateral
Examples
Answer
 a foursided polygon
Explanation

244
quotient
Examples
Answer
 the result of a division problem
Explanation

245
radical expressions
Examples
Answer
 An expression involving a radical sign
Explanation

246
radius of a circle
Examples
Answer
 the distance from the center to a point on the circle
Explanation

247
random sample
Examples
Answer
 a sample in which every element in the population has an equal chance of being selected
Explanation

248
range of a data set
Examples
Answer
 the difference between the greatest and the least values in a set of numbers.
Explanation

249
range of a function
Examples
Answer
 all values are out put variables
Explanation

250
rate
Examples
Answer
 A ratio of two quantities measured in different units.
Explanation

251
rate of change
Examples
Answer
 A ration that compares the amount of change in the dependent variable to the amount of change in the independent variable
Explanation

252
ratio
Examples
Answer
 Comparing two quantities by division
Explanation

253
rational number
Examples
Answer
 A number that can be written with an integer in the numerator and a positive integer in the denominator.
Explanation

254
ray
Examples
Answer
 A part of a line, with one endpoint, that continues without end in one direction
Explanation

255
real numbers
Examples
Answer
 the set of numbers that includes rational and irrational numbers.
Explanation

256
reciprocals
Examples
Answer
 two numbers are reciprocals if their product is 1
Explanation

257
rectangle
Examples
Answer
 a parallelogram with four right angles
Explanation

258
rectangular prism
Examples
Answer
 A prism with rectangular bases
Explanation

259
reflection
Examples
Answer
 A transformation that flips the figure over the line of reflection
Explanation

260
reflex angle
Examples
Answer
 An angle between 180º and but less than 360º
Explanation

261
regular polygon
Examples
Answer
 a polygon with all sides and all angles equal
Explanation

262
regular pyramid
Examples
Answer
 a pyramid whose base is a regualr polygon
Explanation

263
regular tessillation
Examples
Answer
 a teswsillation made from one type of regular polygon
Explanation

264
relation
Examples
Answer
 a set of ordered pairs
Explanation

265
relative frequency
Examples
Answer
 the ratio of the number of observations in a statistical category to the total number of observations
Explanation

266
relatively prime numbers
Examples
Answer
 two or more nonzero whole numberers whose greatest common factor is 1
Explanation

267
remainder
Examples
Answer
 the part of the dividend that is left over when the dividend is not evenly divisible by the divisor
Explanation

268
repeating decimal
Examples
Answer
 a decimal that repeats a digit or group of digits forever
Explanation

269
rhombus
Examples
Answer
 a parallelogram with four equal sides
Explanation

270
right angle
Examples
Answer
 an angle measuring 90º
Explanation

271
right triangle
Examples
Answer
 a triangle with one right angle
Explanation

272
rise
Examples
Answer
 the vertical of change between to end points
Explanation

273
rotation
Examples
Answer
 A transformation in which every point of the preimage is rotated by a given angle about a point.
Explanation

274
rotational symmetry
Examples
Answer
 is a rotation of 180 degrees or less that maps the figure onto itself
Explanation

275
round
Examples
Answer
 To find the nearest value of a number based on a given plase value.
Explanation

276
round numbers
Examples
Answer
 numbers used in estimation
Explanation

277
run
Examples
Answer
 the horizontal change when the slope of a line
Explanation

278
sample
Examples
Answer
 a part of a population
Explanation

279
sample space
Examples
Answer
 the set of all possible outcomes
Explanation

280
scale
Examples
Answer
 in a scale drawing, the scale gives the relationship between the drawing's dimension's and the actual dimensions.
Explanation

281
scale drawing
Examples
Answer
 A diagram of an object in which the dimensions are in proprtion to the actual dimensions of the object.
Explanation

282
scale factor
Examples
Answer
 The ratio of the lengths in a dilation between the values of two variables.
Explanation

283
scale model
Examples
Answer
 A model of an object in which the dimensions are in proportion to the actual dimensions of the object.
Explanation

284
scalene triangle
Examples
Answer
 a triangle with no two sides of equal length
Explanation

285
scatter plot
Examples
Answer
 A graph that displays two sets of data as ordered pairs (points)
Explanation

286
scientific notation
Examples
Answer
 the method of expressing a very large or very small number number by multiplying a number between 1 and 10 by some power of 10
Explanation

287
segement
Examples
Answer
 one of many identical or almost identical repeating body parts.
Explanation

288
sequence
Examples
Answer
 the action of following in order
Explanation

289
set
Examples
Answer
 collection of distinct objects
Explanation

290
similar polygons
Examples
Answer
 Polygons that have the same shape, but not necessarily the same size. Corresponding sides of similar polygons are proportional.
Explanation

291
similar triangles
Examples
Answer
 triangles that have the same shape but not necessarily the same size.
Explanation