Find Supplementary Angle
Supplementary Angles: Learn
Two angles are supplementary if the sum of their angles equals 180° (they add up to a straight line).
If one angle is known, its supplementary angle can be found by subtracting the measure of its angle from 180°.
Example: What is the supplementary angle of 43°?
Solution: 180° - 43° = 137°
Supplementary Angles: Practice
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