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# 8th Grade Math Cumulative Vocabulary Words

Maintaining mathematical literacy and academic content rigor.
Math Teacher: Mr. Santiago.
Across
Angles in a plane that share a common vertex and common side but do not overlap.
Angles having the same relative position in similar figures.
Two figures are congruent if one is an image of the other under a translation, a reflection, a rotation, or some combination of these transformations. Put more simply, two figures are congruent if you can slide, flip, or turn one figure so it fits exactly on the other.
A relationship between two variables in which the value of one variable depends on the value of the other variable. For example, the distance d in miles covered in t hours by a car traveling at 55 mph is given by the equation d=55t . The relationship between the distance and the time is a function, and we say that the distance is a function of the time.
One of the two variables in a relationship. Its value depends upon or is determined by the other variable called the independent variable.
Variables that measure characteristics using “words” that represent possible responses within a given category.
The figure formed by two rays or line segments that have a common vertex and is measured in degrees.
The number of miles per hour averaged over an entire trip. For instance, if you travel 140 miles in 2 hours, then the average speed is 70 miles per hour.
A triangle having each angle measure less than 90 degrees.
Down
A three-dimensional shape with six identical square faces. Also, a right rectangular prism.
Whole numbers in sequence that follow each other, such as 31, 32, 33 or 52, 53, 54.
A pair of angles whose measures add to 90 degrees.
Two numbers, a and b, that satisfy the equation a+b=0 . For example, 3 and −3 are additive inverses, and 12 and −12 are additive inverses.
A quantity expressed as a number raised to a power.
Two sides that meet at a vertex.
A transformation that enlarges or reduces a figure by a scale factor about a center point so that the original figure and its image are similar.
A three-dimensional shape with two opposite faces that are parallel and congruent circles. The side (lateral surface) is a rectangle that is “wrapped around” the circular faces at the ends.
If A=s3 , then s is the cube root of A. For example, 2 is the cube root of 8 because 2·2·2=8 . The      ⎯⎯⎯⎯√3 symbol is used to denote the cube root.