8th Grade Math
Terms
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Acute Angle
pg 70 - An Angle that has a degree measure between 0 and 90.
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Acute Triangle
pg 70 - A triangle with three acute angles.
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Addition Property of Equality
pg 44 - Adding the same member to each side of an equation results in a equivalent equation.
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Adjacent Angles
pg 64 -
Angles that have a common side, the same vertex,
and do not overlap. -
alternate exterior angles
pg 66 -
When a transversal intersects two lines and on opposite sides of the transversal.
1 2
3 4
5 6
7 8 -
Alternate interior Angles
pg 66 -
When a transversal intersects two parallel lines, the angles between the two lines and on opposite sides of the transversal.
1 2
3 4
5 6
7 8 -
Altitude of a Triangle
pg 89 - A line segment from a vertex and perpendicular to the opposite side.
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Angle
pg 70 -
Two rays with a common endpoint.
DEF = DEF -
Arithmetic Sequence
pg 3 - A list of numbers where consecutive numbers have the same difference.
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Associative Properties
pg 10 - The way in which addends or factors are grouped does not changed the answer.
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Average
pg 150 - Adding the numbers together, and dividing the sum by the addends.
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base (of an exponent)
pg 4 -
The number that is used as a factor in a power.
In the base is 4. -
bisect
pg 78 - To separate a figure into two congruent parts.
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box and whisker plot
pg 156 - A way to organize numerical data to show the median, quartile, and interquartile range.
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Circle
pg 89 - A plane figure formed by all points that are the same distance from a given point in the plane called the center.
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Circumcenter
pg 89 - The intersection of the three perpendicular bisectors of the sides of a triangle. It is used to draw a circumscribed circle around a triangle.
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Common Factor
pg 94 - A whole number that is a factor of two or more given whole numbers. 3 is a common factor of 6 and 9.
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Common Multiple
pg 96 - A whole number that is multiple of two or more givine whole numbers. 36 is a common multiple of 6 and 9.
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Commutative Properties
pg 10 -
The order in which numbers are added or multiplied does not change the answer.
8 + 5 = 5 + 8
2 x 30 = 30 x 2 -
Complementary angles
pg 64 - Two angles are complementary of the sum of their degree measures is 90.
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Congruent Figures
pg 68 - Figures that have the same size and shape.
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Constructions
pg 78 - Drawings made with a straighedge and a compass.
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Correlation
pg 160 - Relationship between two variables.
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Corresponding angles
pg 66 -
When a transversal intersects two parallel lines, the angles in similar positions.
1 2
3 4
5 6
7 8 -
Cube Root
pg 6 -
One of three equal factors of a number. 2 is the cube root of 8
since 2 x 2 x 2 = 8 -
Data
pg 148 - Numerical information
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Decimal (Decimal fraction)
pg 104 - A way of expressing factions that have denominators of 10,100, 1000 and so on.
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Degree
pg 64 - A common unit of measure for angles.
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Diagonal
pg 70 - A line segment from one vertex of a polygon to any nonadjacent vertex.
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Diameter
pg 89 - A chord of a cicle that contains the center of the circle.
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Distributive Property of Multiplication over Addition
pg 10 -
The product of a number and a sum is equal to the sum of the products.
2x(4+3)=(2x4)+(2x3) -
Divisible
pg 92 -
A number is divisible by another if, upon division, the remainder is zero.
15 is divisible by 5 -
Division Property of Equality
pg 46 -
Dividing each side of an equation by the same non zero number results in an equivalent equation.
6n=78
n= 13 -
Equation
pg 38 -
A mathematical sentence with an equals sign.
25-17=8 -
Equilateral Triangle
pg 62,70 - A triangle that has three congruent sides.
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Equivalent Equations
pg 44 -
Equations that have the same solution.
Examples:
x+3=7 and x=4 . -
Equivalent Fractions
pg 94 - Fractions that name the same number.
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Expanded Form
pg 4 -
A form of a number that shows the place value of each digit.
916 = 900 + 10 + 6
916 = (9 x 100) + (1 x 10) + (6 X 1) -
Exponent
pg 4 -
A number used to tell how many times the base is used as a factor.
10 -
Extremes
pg 156 - Lowest and highest points of a set of numerical data