Complementary angles have a sum of 90 degrees.
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The sum of two complementary angles is 90 degrees.
90 degrees
90 degrees
Two angles that have the same measure and sum up to 90 degrees are complementary angles. For example, if one angle measures 45 degrees, the other angle will also measure 45 degrees, and their sum will be 90 degrees.
The sum of an angle and its complement is 90 degrees. So the unknown angle must be 90 - 75 = 15 degrees.