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Complementary angles are two angles with a sum of 90Âº. Supplementary angles are two angles with a sum of 180Âº. Vertical angles are two angles whose sides form two pairs of opposite rays. We can think of these as opposite angles formed by an X. The Lesson:
Complementary and supplementary angles Angle relationship equations Video transcript We're told that the measure of angle QPR-- so that's this angle right over here-- is 2x plus 122.