• Complementary angles
  Two angles are said to be complementary if their sum is 90^o. 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 180^o).
  Here's a problem for you:
  What is the measure of the missing angle in this right triangle?
  The missing angle and the 45 degree angle are complementary.

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