If you're talking about two angles adding up to equal a total measure of 90, then the answer to your question is complementary angles.
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Two angles the sum of whose measures is 90 degrees are complimentary angles.
complementary
Two angles are complementary if the sum of their measures is 90 degrees.Two angles are supplementary if the sum of their measures is 180 degrees.
Complementary angles.
They are complementary angles