G8

Grade 8 • Glossary

Term Definition Example Unit unit rate a ratio showing a comparison to one; a rate with a denominator of 1

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unobserved data

data that has not been collected, but can be predicted by using a line of best fit

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variable a letter or symbol that represents an unknown value

7 m = 21; m is the variable 4

vertical angles angles opposite each other when two lines cross; are congruent

angles 2 and 4 angles 1 and 3

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vertical line test

uses a vertical line to check that points on the graph intersect at exactly one point; visual way to determine if a graph is a function

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volume (^) the amount of space a solid
figure occupies; capacity
measured in cubic units
V= B · h
Cylinder: V=
Cone: V=
Sphere:
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Grade 8 • Glossary