One angle of a pair of complementary angles is 45. What is the measurement of the other angle?

Complementary angles are two angles that add up to 90 degrees.

If one angle is 45 degrees, we subtract it from the 90. 90 - 45 = 45. The measure of your second angle is 45 degrees.

The definition of complementary is that the angles add up to equal 90. Therefore, if one angle measures 45, then its complement is also 45 because 45 + 45 = 90.