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Complementary angles add up to one right angle (90 degrees), such as 30 degrees and 60 degrees. Supplementary angles add up to a straight angle, which is 2 right angles (180 degrees). So the supplement of a 30 degree angle is 150 degrees.

For any given angle, its supplement is 90 degrees greater than its complement.

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Q: What is the difference between complementary and supplementary angles?
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