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# Supplementary Angles

Two angles are supplementary angles when the sum of their measures is
In the diagram, and are supplementary because the sum of their measures equals
When using radians as the unit of measure, two angles are supplementary when the sum of their measures is or about radians.
If two angles are supplementary, either both are right angles or one is acute and the other obtuse. When two supplementary angles are adjacent, they are called a linear pair or straight angle pair. Notice that a linear pair forms a straight angle.