**Complementary Angles: ** Pair of angles whose sum is 90^{o}.

**Supplementary Angles: ** Pair of angles whose sum is 180^{o}.

Example - Find the complementary angle of 53

Let the required angle be x

Therefore, x + 53 = 90

==> x = 90 - 53 = 37

Thus, the required complementary angle of 53 is 37

Example - Find the supplementary angle of 53

Let the required angle be x

Therefore, x + 53 = 180

==> x = 180 - 53 = 127

Thus, the required supplementary angle of 53 is 127

The complimentary angle of a is 90 - a

The supplementary angle of a is 180 - a