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.

complementary angle 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.

supplementary angles ABC is the supplement of ∠CBD

 

Have a look at the following video for further explainations of complementry angles and supplementary angles.:

 



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Useful Links:
Math.com - Pairs of Angles
Sparknotes - Pairs of Angles
 

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