Prove that 3 angles are complementary or not why
Complementary angles are two angles whose measures add up to 90 degrees. Complementary angles are always in a pair. When discussing one of the angles in a complementary pair, we can say that one angle is the complementof the other or one angle is complementary to the other.
Three or more angles are also not called complementary, even if their measures happen to add up to 90 degrees.