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Angle Pairs
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  1. Angle Pairs

  2. Vertical Angles • Two angles formed by intersecting lines and have no sides in common. • Are congruent.

  3. Vertical Angles

  4. Supplementary Angles • Two angles sharing one side that add up to exactly 180°

  5. Supplementary Angles

  6. Complementary Angles • Two angles, sharing one side that add up to exactly 90°

  7. Complementary Angles

  8. Adjacent Angles • Adjacent angles share a common vertex and one common side.

  9. Adjacent Angles

  10. Adjacent Angles

  11. 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.

  12. Guess Who? • I am an angle.

  13. Guess Who? • I am an angle. • I have 180°

  14. Guess Who? • I am an angle. • I have 180° • I look like this:

  15. Guess Who? • I am an angle. • I have 180° • I look like this: Supplementary Complementary

  16. Guess Who? • I am two adjacent angles.

  17. Guess Who? • I am two adjacent angles. • I look like an “L” with a line in the middle.

  18. 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:

  19. 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

  20. Guess Who? Complementary Supplementary

  21. Guess Who? Complementary Supplementary

  22. Complementary angles are……. Review

  23. Review • Complementary angles are…….

  24. Review • Supplementary Angles are…..

  25. Supplementary Angles

  26. Vertical Angles are…….

  27. Vertical Angles

  28. Adjacent Angles are…

  29. Adjacent Angles

  30. 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

  31. You try. Are they supplementary or complementary? Find the missing side. x 20

  32. You try. Are they supplementary or complementary? complementary Find the missing side. 90 – 20 = 70 The missing angle Is 70 x 20

  33. One More 50 x

  34. 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

  35. Find the missing angle 130 x What kind of angles? What’s the missing angle?

  36. Find the missing angle 130 x What kind of angles? Supplementary What’s the missing angle? Adds up to 180, so….. 180 – 130 = 50

  37. Find the missing angle x 30 Do this one on your own.

  38. Right

  39. Wrong