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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:
Since the sum of measures of the two supplementary angles is 180â°, we have:    180â° - 165â°12' = 179â°60' - 165â°12' = (179 - 165)â°(60 - 12)' = 14â°48'.