Hands-on math!

Complementary angles

Two angles are said to be complementary if their sum is 90o. This makes them add up to a right angle. In a right triangle, the 2 angles other than the right angle are complementary because they add up to 90 degrees.
(All the angles of a triangle add up to 180o).
Here's a problem for you:

What is the measure of the missing angle in this right triangle? _______ degrees
The missing angle (?) and the 45 degree angle are complementary.