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]

	

	complementary angles
    n 1: two angles whose sum is a right angle