**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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