**> Complementary & Supplementary Angles < **

### Complementary Angles

Two angles are called complementary angles if the sum of their degree

measurements equals 90 degrees. One of the complementary angle is

said to be the complement of the other.

Example:

These two angles (40° and 50°) are Complementary

Angles, because they add up to 90°.

27+ 63 = 90

These two angles (25° and 65°) are Complementary

Angles, because they add up to 90°.

Notice that together they make a right angle.

25 + 65 = 90

(By the way,complementary angles do not necessarilly have to be adjacent angles. In other words,

complementary angles do not have to be side-by-side. The only requirement to be complementary

angles is adding up to 90°.)

**Supplementary Angles**

Supplementary Angles are two angles that add up to 180 degrees.

Example of a Supplementary angles

45+135 =180