➖ Supplementary Angles
Find the angle needed to complete a Straight Angle (180°).
°
Input must be between 0° and 180° to have a positive supplement.
Supplementary Angle B
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°
180° Total
The Definition
For two supplementary angles, A and B:
B = 180° – A
**Disclaimer:** The calculation assumes the input angle is in degrees. The visualization represents the two angles forming a straight line of 180°.