supplementary angles
±two angles whose measures have a sum of 180 degrees
Supplementary angles are a pair of angles that have a sum of 180 degrees. In other words, if you have two angles, and when you add them together the result is 180 degrees, then those two angles are considered supplementary angles.
For example, if angle A measures 70 degrees, and angle B measures 110 degrees, then angle A and angle B are supplementary angles, because 70 + 110 = 180.
Another example is if angle C measures 120 degrees, and angle D measures 60 degrees, then angle C and angle D are also supplementary angles, because again, 120 + 60 = 180.
When working with supplementary angles, it is often useful to use this property to find the measure of one angle if you know the measure of the other angle. For example, if you are given that one angle measures 100 degrees and you are asked to find the measure of its supplementary angle, you can subtract 100 from 180 to get 80 degrees as the measure of the other angle.
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