They are said to be complementary angles that add up to 90 degrees
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Two angles that have a sum of 90 degrees are called complementary angles.
Two angles that add to 90 degrees are called complementary.
They are said to be supplementary angles if they add up to 180 degrees.
They all add up to 360 degrees. Also, opposite angles are congruent (equal) and any two adjacent/consecutive angles add up to 180 degrees. This term is also called supplementary.