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# Glossary

Here's a glossary of common terms you may come across in relation to mathematics, especially in the working world:

absolute value:

The numerical value or worth of a number regardless of its sign; its distance from zero. For example, the absolute value of both +5 and −5 is 5.

acute angle:

An angle that measures less than 90 degrees.

Number with the same numerical part but the opposite sign (plus or minus) of the given number. For example, if zero is the sum of two numbers, the two numbers are additive inverses of each other.

Angles that share a vertex (corner) and have a side in common.

Sides of a polygon that share a vertex.

altitude:

Also known as the height of a triangle; a segment drawn from a vertex of a triangle to its opposite side so that it forms right angles with the opposite side.

angle:

A figure formed by two rays that have a common endpoint.

angle bisector:

A ray that cuts an angle in half.

arc:

A portion of a circle's edge, or circumference.

area:

Measure of a specified region in a plane.

associative property:

Characteristic of addition and multiplication that allows the grouping of terms to change without affecting the result.

base:

Value multiplied repeatedly in an exponential expression.

binary operation:

Process requiring two values to produce a third value.

binomial:

Two terms separated by addition or subtraction.

bisect:

To divide a segment or an angle into two congruent (equal) parts.

central angle:

An angle whose vertex is the center ...

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