## Supplementary

### either of two angles whose sum is 180°.

Supplementary angles are a pair of angles whose sum is 180 degrees. In other words, if you add the angle measures of two supplementary angles, the result will be 180 degrees. For example, if angle A and angle B are supplementary, then A + B = 180 degrees.

Supplementary angles are often denoted by a small box in the corner of the angle symbol or by a small s next to the angle measure. For instance, if angle A is supplementary to angle B, we might write it as ∠A = 180° – ∠B or ∠A = ∠B s.

An important thing to know is that a pair of supplementary angles does not have to be adjacent (next to each other) or even placed in the same position in different figures. As long as they add up to 180 degrees, they are supplementary.

Supplementary angles are commonly used in geometry, trigonometry, and physics to solve problems involving angles and triangles.

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