Supplementary Angles Add Up to 180

Since two sectors with supplementary angles make half a circle, supplementary angles always add up to half of 360 degrees, or 180 degrees. See some examples below. Click the buttons to compare pairs of sectors in a half circle with their supplementary angles.

Angles

1. Angles and Fraction Circles
2. Angles and Twelfths
3. Angles and Clock
4. Fraction Circles and Clock
5. Angles and Protractor
6. Supplementary Angles Add Up to 180
7. Half Circle Protractor
8. Measure Supplementary Angles
9. How to Name Angles
10. Supplementary Angle Puzzles
11. Connect the Dots: Angles
12. Complementary Angle Puzzles
13. Angle Bisector Puzzles
14. Vertical Angle Puzzles
15. Triangle Tiling
16. Guess the Angle

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