549intersecting lines Lines that meet or cross.
(p. 332)
interval The number of units between spaces
on a graph. (p. 316)
inverse operations Mathematical operations
thatundoeach other, such as addition and
subtraction or multiplication and division.
(p. 222)
irrational number A number whose decimal
form is nonrepeating and nonterminating.
(p. 472)
isosceles triangle A triangle with two
congruent sides. (p. 344)
iteration A step in the process or repeating
something over and over again. (p. 364)
L
lateral faces The faces of a prism or pyramid
that are not bases. (p. 362)
line graph A graph that uses points on a grid
connected by line segments to show data.
(p. 308)
line of symmetry A line that divides a figure
into two congruent parts. (p. 358)
line segment A part of a line that has two
endpoints. (p. 338)
linear equation An equation whose graph is a
straight line. (p. 519)
linear measure A measure of length.
(pp. 448, 452)
lower extreme The least number in a set of
data. (p. 304)
lower quartile The median of the lower half of a
set of data. (p. 304)
M
mass The measure of the amount of matter an
object contains. (p. 450)
mathematical expression A symbol or a
combination of symbols that represents a
number. (p. 52)
mean The average of a set of numbers. (p. 300)
measures of central tendency Themean,
median,andmodeof a set of data. (p. 300)
median The middle number of a set of numbers
arranged in order. If there is an even number of
numbers, the median is the average of the two
middle numbers. (p. 300)metric system The measurement system
based on the meter, gram, and liter.
(SeeTable of Measures,p. 564.)
midpoint A point that divides a line segment
into two congruent segments. (p. 333)
mixed number A number that is made up of a
whole number and a fraction. (p. 190)
mode The number that appears most frequently
in a set of numbers. (p. 300)
multiple A number that is the product of a given
number and any whole number. (p. 194)
Multiplication Property of Equality If both
sides of an equation are multiplied by the
same nonzero number, the sides remain
equal. (p. 134)
mutually exclusive events Events that cannot
occur at the same time. (p. 274)
N
negation The denial of a given statement.
(p. 245)
net A flat pattern that folds into a solid figure.
(p. 362)
n-gon A polygon of nsides. (p. 350)
O
obtuse angle An angle with a measure greater
than 90° and less than 180°. (p. 344)
obtuse triangle A triangle with one obtuse
angle. (p. 344)
octagon A polygon with eight sides. (p. 342)
odds A comparison of favorable outcomes and
unfavorable outcomes. (p. 281)
opposite integers Two integers that have
the same distance from 0 on the number line.
(p. 150)
order of operations The order in which
operations must be performed when more than
one operation is involved. (p. 122)
ordered pair A pair of numbers used to locate a
point in the coordinate plane. The first number
is the x-coordinate and the second number is
they-coordinate. (p. 504)
origin The point (0,0) in the coordinate plane
where the x-axis and the y-axis intersect.
(p. 502)
outcome The result of a probability experiment.
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