There is no limit to the number of pairs of angles that add to 90°. Some common ones include 45° + 45° and 30° + 60°.
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Two angles whose sum is 90 degrees are called complementary angles.
The sum of two complementary angles is 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.
They are a complementary pair of angles.
Complementary