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The sum of two complementary angles is 90.

E.g. 30 degrees and 60 degrees are each others complementary angles.

The sum of two supplementary angles is 180.

E.g. 105 and 75 are each others supplementary angles.
Supplementary angles are those whose angles add up to 180 degrees. Complementary angles are those whose angles add up to 90 degrees.

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Q: What are supplementary and complementary angles?
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