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### 15 Cards in this Set

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 absolute value The distance of a number from zero; the positive value of a number. acute angle A positive angle measuring less than 90 degrees. acute triange A triangle each of whose angles measures less than 90 degrees. additive identity A triangle each of whose angles measures less than 90 degrees. additive inverse The additive inverse of any number x is the number that gives zero when added to x. The additive inverse of 5 is -5. adjacent angles Two angles that share both a side and a vertex. angle The union of two rays with a common endpoint, called the vertex. arc A portion of the circumference of a circle. area The number of square units that covers a shape or figure. associative property of addition (a + b) + c = a + (b + c) associative property of multiplication (a + b) + c = a + (b + c) average A number that represents the characteristics of a data set. axis of symmetry A line that passes through a figure in such a way that the part of the figure on one side of the line is a mirror reflection of the part on the other side of the line. base The bottom of a plane figure or three-dimensional figure. bisect To divide into two congruent parts.