Supplementary angles
Two angles whose sum is 180 degrees
Supplementary angles are two angles that add up to 180 degrees. In other words, if you have two angles that are supplementary, then when you add their measures, the result will be 180 degrees.
For example, let’s say we have two angles, angle A and angle B. If angle A measures 90 degrees, then angle B must measure 90 degrees as well in order for the two angles to be supplementary, since 90 + 90 = 180. If angle A instead measures 120 degrees, then angle B would need to measure 60 degrees in order for the two angles to be supplementary, since 120 + 60 = 180.
Supplementary angles are important in geometry and trigonometry, as many problems and concepts involve working with angles that add up to 180 degrees. It’s also worth noting that if two angles are supplementary, then each angle is called the supplement of the other.
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