Two angles whose measures add to 90 are complementary angles. An example is 45 and 45.
The angles are complimentary when they add to 90 degrees.
Complementary
Complementary angles add to 90 degrees.
Complementary, (and two angles whose measures add up to 180 degrees are Supplementary)
They are complementary angles that add up to 90 degrees
Complementary angles
Complementary angles are when the angle measures of the two angles add up to 90.
They are "complementary" angles, and both are obviously acute angles.
Two angles the sum of whose measures is 90 degrees are complimentary angles.
Vertical angles
Two angles with a sum of 90 are called complimentary angles.