Complementary angles
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sometimes... * * * * * No, never. Two angles are complementary angles if their measures sum to 90 degrees. An obtuse angle has a measure in the range (0, 90) degrees so two of them cannot sum to 90 degrees.
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.
The sum of the angles of a triangle is 180 degrees. A right angle is 90 degrees. So the sum of the remaining two acute angles of a right triangle is 90 degrees.
Two angles are complementary if and only if their sum is 90 degrees.
complementary