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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:
When adjacent angles add to , the two non-common rays form a straight angle, and the two angles are called a linear pair: The word supplementary is given when two angles add to 180o. This word is less specific than linear pair in that the angles do not have to be adjacent. Their measures just have to add to 180o.