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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:
And then if you have two angles that add up to 180 degrees, they're considered supplementary. And then if they happen to be adjacent, they will form a straight angle. Or another way, if you said, if you have a straight angle and you have one of the angles, the other angle is going to be supplementary to it.