A
absolute error (AB-suh-loot ER-ur) An error in a
measurement that is the actual size of the error.
(p. 273)
absolute value(AB-suh-loot VAL-yoo) The
distance of a number from 0 on a number line.
The symbol for absolute value is | |. (p. 3)
absolute-value function (AB-suh-loot VAL-yoo
FUHNGK-shuhn) When graphed on a
coordinate plane, a function that takes a
V-shaped form. (p. 367)
accuracy (AK-yuh-ruh-see) A term that refers to
how close a measurement is to the actual value.
(p. 272)
acute angle (uh-KYOOT ANG-guhl) An angle
having a measure that is greater than 0 and less
than 90. (p. 242)
acute scalene triangle (uh-KYOOT skay-LEEN
TRYE-ang-guhl) A triangle with three acute
angles and no congruent sides. (p. 254)
acute triangle (uh-KYOOT TRYE-ang-guhl) A
triangle with three acute angles. (p. 254)
Addition Property of Equality(uh-DISH-uhn
PROP-ur-tee UHV i-KWOL-uh-tee) When you
add the same number to both sides of an
equation, you get a true statement. If a b,
then a c b c. (p. 38)
Addition Property of Inequality(uh-DISH-uhn
PROP-ur-tee UHV in-i-KWOL-uh-tee) If ab,
then acbc. This statement is also true if
is replaced by , , or. (p. 60)
Additive Inverse Property (AD-i-tiv IN-vurss
PROP-ur-tee) The sum of two inverse (opposite)
numbers equals zero. a (a) 0. (p. 14)
additive inverses (opposites) (AD-i-tiv IN-vurss-
iz [OP-uh-zitz]) Two numbers whose sum is 0. (p. 9)
adjacent angles (uh-JAY-suhnt ANG-guhlz) Two
angles that share a common side and vertex but
have no common interior points. (p. 244)
algebraic equation(al-juh-BRAY-ik
i-KWAY-zhuhn) An equation that contains one
or more variables and at least one mathematical
operation. It may also contain numbers. (p. 34)
algebraic expression (al-juh-BRAY-ik ek-
SPRESH-uhn) An expression that contains one
or more variables and at least one mathematical
operation. It may also contain numbers. (p. 30)
algebra tiles (AL-juh-bruh TYELZ)
Manipulatives used to model algebraic
expressions or polynomials. (p. 44)alternate exterior angles (AWL-tur-nit
ek-STEER-ee-ur ANG-guhlz) For two lines
intersected by a transversal, a pair of nonadjacent
angles that lie outside the two lines and are on
opposite sides of the transversal. (p. 246)
alternate interior angles (AWL-tur-nit
in-TEER-ee-ur ANG-guhlz) For two lines
intersected by a transversal, a pair of nonadjacent
angles that lie between the two lines and are on
opposite sides of the transversal. (p. 246)
altitude of a parallelogram(AL-ti-tood UHV UH
pa-ruh-LEL-uh-gram) A perpendicular line
segment from the base to the opposite side. (p. 282)
angle(ANG-guhl) A figure formed by two rays with
a common endpoint called the vertex. (p. 240)
angle of rotation (ANG-guhl UHV
roh-TAY-shuhn) For a figure that has rotational
symmetry, the smallest turn of the figure that
creates a match. (p. 290)
arc (ARK) A part of a circle with all its points on
the circle. (p. 262)
area (AIR-ee-uh) The number of square units that
cover a figure. (p. 282)
arithmetic sequence (a-rith-MET-ik SEE-kwuhnss)
A sequence of numbers in which each number is
found by adding a fixed number to the number
before. (p. 352)
Associative Property of Addition
(uh-SOH-shuh-tiv PROP-ur-tee UHV
uh-DISH-uhn) Changing the grouping of the
addends does not change the sum.
(ab) ca(bc). (p. 14)
Associative Property of Multiplication
(uh-SOH-shuh-tiv PROP-ur-tee UHV
muhl-tuh-pluh-KAY-shuhn) Changing the
grouping of the factors does not change the
product. (a• b) • ca• (b• c). (p. 14)
B
back-to-back stem-and-leaf plot (BAK-TOO-BAK
STEM-AND-LEEF PLOT) A display that
compares two sets of data by showing “leaves” on
both sides of the “stem.” (p. 221)
balance (BAL-uhnss) The sum of the principal plus
the interest earned. (p. 200)
base(BAYSS) 1. In exponential form, the number
or expression being used as a factor. (p. 18)- A selected side or face of a geometric figure.
(pp. 282, 302)
base angles (BAYSS ANG-guhlz) The angles
opposite the congruent sides of any isosceles or
equilateral triangle. (p. 257)
424 Glossary