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Hi, there--
Two angles are COMPLEMENTARY if the sum of their measures is 90 degrees.
For example, a 30-degree angle and a 60-degree angle are complementary because 30+60=90.
Two angles are SUPPLEMENTARY if the sum of their measures is 180 degrees.
For example, a 30-degree angle and a 150-degree angle are supplementary because 30+180=90.
Hope this helps!
~Mrs. Figge
math.in.the.vortex@gmail.com