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## Angle Pairs

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**Vertical Angles**• Two angles formed by intersecting lines and have no sides in common. • Are congruent.**Supplementary Angles**• Two angles sharing one side that add up to exactly 180°**Complementary Angles**• Two angles, sharing one side that add up to exactly 90°**Adjacent Angles**• Adjacent angles share a common vertex and one common side.**Supplementary vs. ComplementaryHow do I remember?**• The way I remember is this: • C comes before S in the alphabet. • 90 comes before 180 when I count. • Complementary is 90, Supplementary is 180.**Guess Who?**• I am an angle.**Guess Who?**• I am an angle. • I have 180°**Guess Who?**• I am an angle. • I have 180° • I look like this:**Guess Who?**• I am an angle. • I have 180° • I look like this: Supplementary Complementary**Guess Who?**• I am two adjacent angles.**Guess Who?**• I am two adjacent angles. • I look like an “L” with a line in the middle.**Guess Who?**• I am two adjacent angles. • I look like an “L” with a line in the middle. • I add up to 90° • I look like this:**Guess Who?**• I am two adjacent angles. • I look like an “L” with a line in the middle. • I add up to 90° • I look like this: Complementary Supplementary**Guess Who?**Complementary Supplementary**Guess Who?**Complementary Supplementary**Complementary angles are…….**Review**Review**• Complementary angles are…….**Review**• Supplementary Angles are…..**Find the missing angle**I know that these angles are complementary. They must add up to 90° So…… 90 – 55 = 35 The missing angle is 35 55 x**You try.**Are they supplementary or complementary? Find the missing side. x 20**You try.**Are they supplementary or complementary? complementary Find the missing side. 90 – 20 = 70 The missing angle Is 70 x 20**One More**50 x**Find the missing angle**120 x I know these are supplementary angles. Supplementary angles add up to 180. The given angle is 120. So….. 180 – 120 = 60 The missing angle is 60**Find the missing angle**130 x What kind of angles? What’s the missing angle?**Find the missing angle**130 x What kind of angles? Supplementary What’s the missing angle? Adds up to 180, so….. 180 – 130 = 50**Find the missing angle**x 30 Do this one on your own.