Complementary Angles and Supplementary Angles

In geometry, pairs of angles can relate to each other in several ways. In this lesson we will explain complementary angles and supplementary angles.

Complementary Angles

Two angles are called complementary angles if the sum of their degree measurements equals 90 degrees. One of the complementary angles is said to be the complement of the other.

∠ABC is the complement of ∠CBD

 

Supplementary Angles

Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. One of the supplementary angles is said to be the supplement of the other.

∠ABC is the supplement of ∠CBD

Have a look at the following videos for further explainations of complementary angles and supplementary angles.:

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