Geometry:

Complementary and Supplementary

Complementary angles are two angles that add up to 90 degrees.

Usually you are given one angle and are asked to find the complementary angle.

For example: Find the complementary angle of 33 degrees.

• We need to subtract, 90 - 33 = 57
• 57 is the complementary angle to 33

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

For example: Find the supplementary angle of 33 degrees.

• We need to subtract, 180 - 33 = 147

147 is the supplementary angle to 33.

Watch the video below for a detailed explanation!

Practice Math Problems

1. What is the complementary angle of 37?
2. What is the complementary angle of 88?
3. What is the complementary angle of 5?
4. What is the complementary angle of 29?
5. What is the complementary angle of 66?
6. What is the supplementary angle of 37?
7. What is the supplementary angle of 121?
8. What is the supplementary angle of 12?
9. What is the supplementary angle of 170?
10. What is the supplementary angle of 60?