Using this knowledge, we can begin to solve for unknown angles: Sample A Two angles, measuring 50 degrees and 40 degrees, are complementary because their sum is 90 degrees, as shown in the diagram below: Complementary AnglesĪs you may know, two angles are complementary if the sum of their degree measures equals 90 degrees. Determining that a pair of angles is complementary, supplementary, or vertical may be useful in determining other unknown angles. Two angles may share a certain relationship that will be useful in solving a geometric problem.
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