complementary angles
Two acute angles that add up to π/2
Complementary angles are two angles whose sum adds up to 90 degrees. In other words, when you add the measure of two complementary angles together, the result will always equal 90 degrees. For example, if angle A measures 30 degrees, then the angle that is complementary to it, angle B, will measure 60 degrees, since 30 + 60 = 90.
Complementary angles are often used in geometry to solve for unknown angles in a diagram. If one angle in a diagram is known to be complementary to another angle, then the sum of those angles can be set equal to 90 degrees, and the equation can be solved algebraically to find the measure of the unknown angle.
It is important to note that two angles cannot be complementary if one or both of the angles is greater than 90 degrees. In that case, the angles are referred to as obtuse angles.
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