Two angles are called complementary if their measures add to 90 degrees, and called supplementary if their measures add to 180 degrees. Note that in these definitions, it does not matter whether or not the angles are adjacent; only their measures matter.

Complementary angles add up to 90° - example: 15° & 75° are complementary (added together, they form a right angle) -and- Supplementary angles add up to 180° - example: 50° & 130° are supplementary (added together, they form a straight line)

A pair of angles are said to be supplementary if their sum is 180 degrees. A pair of angles are said to be complementary if their sum is 90 degrees. Supplement of an angle x° is (180 - x)°. The complement of an angle x° is (90 - x)°. They can be joined together to form a straight angle. They can be joined together to form a right angle.

Supplementary angles are two angles whose angle measures sum to 180 degrees. For example, if one angle is 120 degrees and another angle is 60 degrees, the two angles are supplementary. Complementary angles are two angles whose angle measures sum to 90 degrees.