supplementary angle

supplementary angleEach of the two angles shown is a supplementary angle to the other one.

supplementary angle

n. The angle or arc that when added to a given angle or arc makes 180° or a semicircle.

supplementary angle

n (Mathematics) either of two angles whose sum is 180°. Compare complementary angle

sup′plemen′tary an′gle

n. either of two angles that added together produce an angle of 180°. Compare complementary angle.