Found 2 items, similar to Complementary angles.
English → English (WordNet) Definition: complementary angles complementary angles n : two angles whose sum is a right angle
English → English (gcide) Definition: Complementary angles Complementary \Com`ple*men"ta*ry\, a. Serving to fill out or to complete; as, complementary numbers. [1913 Webster] Complementary colors. See under Color. Complementary angles (Math.), two angles whose sum is 90[deg]. [1913 Webster]