11/2/2022 0 Comments Supplementary angle theoremSubtract angle 2 from both side and you will get angle 1 = angle 3. By substitution, angle 1 + angle 2 = angle 3 + angle 2. Proof: By the definition of supplementary angles, angle 1 + angle 2 = 180 degrees. Complementary Angles Definition Two angles are said to be complementary angles if they add up to 90 degrees. If the sum of the two angles is equal to the measurement of a right angle then the pair of angles is said to be complementary angles.
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