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| The distance of a number from zero; the positive value of a number. |
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| A positive angle measuring less than 90 degrees. |
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| A triangle each of whose angles measures less than 90 degrees. |
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| The number zero is called the additive identify because the sum of zero and any number is that number. |
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| The additive of any number x is the number that gives zero when added to x. The additive inverse of 5 is -5. |
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| Two angles that share both a side and a vertex. |
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| The union of two rays with a common endpoint, called the vertex. |
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| A portion of the circumference of a circle. |
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| The number of square units that covers a shape or figure. |
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| associative property of addition |
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| associative property of multiplication |
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Definition
| (a x b) x c = a x (b x c) |
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| A line that passes through a figure in such a way that the part of figure on one side of the line is a mirror reflection of the part on the other side of the line. |
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| The bottom of a plane figure or three- dimensional figure. |
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| To divide into two congruent parts. |
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| A system in which points on a plane are identified by an ordered pair of numbers, representing the distances to two or three perpendicular axes. |
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| An angle that has its vertex at the center of a circle. |
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| A line segment that connects two points on s curve. |
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| The set of points in a plane that are a fixed distance from a given point, called the center. |
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Definition
| The distance around a circle. |
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| A constant that multiplies a variable. |
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| points are collinear if they lie on the same line. |
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| A selection in which order is not important. |
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| A factor of two or more numbers. |
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| A multiple of two or more numbers. |
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