Supplementary angles refer to the pair of angles that always sum up to 180°. These two angles are called supplements of each other. The word supplementary comes from two Latin words Supplere and Plere where

definition of a supplementary angle: an angle that is supplementary to another angle is an angle in which the sum of both angles forms a straight line or 180

Supplementary angles are two angles whose measures have a sum of 180°. Each angle is the supplement of the other. Supplementary angles can be adjacent or nonadjacent. Adjacent

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