# Complementary Angles

When the sum of the measures of two angles is 90°, the angles are called **complementary angles**.

For examples the following pairs are complementary:

(a) 30° and 60°

(b) 45° and 45°

(c) 10° and 80°

When two angles are complementary, each angle is said to be the **complement** of the other angle. The '**10° angle**' is complement of the '**80° angle**'.