Complementary and Supplementary Angles

Two angles are complementary if their measures add to 90^o. Each is said to be the complement of the other.

Two angles are supplementary if their measures add to 180^o. Each is said to be the supplement of the other. When two angles form a linear pair, then they are supplementary. But "supplementary" doesn't refer to just linear pairs. Any two angles whose measures add to 180^o are supplementary.

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