1. SPECIAL PAIRS OF ANGLES

2. Congruent Angles: Two angles that have equal measures.

3. Congruent Angles A B

4. Angle Bisector: a ray that divides an angle into 2 congruent angles.

5. Angle Bisector B C

6. Suppose bisects and andFind: B C A D

7. Suppose bisects and andFind: B C A D

8. Adjacent Angles: two coplanar angles that share a common vertex and side, but have no interior points in common.

9. Adjacent Angles

10. Nonadjacent Angles

11. Linear Pair: A pair of adjacent angles whose non-common sides are opposite rays.

12. Linear Pair

13. How many Linear pairs can you name?

14. Vertical Angles: Two non-adjacent angles formed when 2 lines intersect

15. Vertical Angles

16. Also Vertical Angles

17. The Angle Addition Postulate: If C is a point in the interior of then:

18. B C A D For adjacent angles

19. B C A D

20. B C A D

21. Supplementary Angles: Two angles whose measures total 180

22. Supplementary Angles A B

23. Suppose two angles are supplementary. If one angle is 30 degrees, what is the measure of its supplement?

24. Suppose two angles are congruent and supplementary. What are their measures?

25. Suppose two angles are supplementary. If one angle is x degrees, what is the measure of its supplement?

26. Complementary Angles: Two angles whose measures total 90

27. Complementary Angles A B

28. Suppose two angles are complementary. If one angle is 30 degrees, what is the measure of its complement?

29. Suppose two angles are congruent and complementary. What are their measures?

30. Suppose two angles are complementary. If one angle is x degrees, what is the measure of its complement?

31. Perpendicular Lines: Two lines that intersect to form right angles.

32. Perpendicular lines form 4 right angles:

33. Perpendicular Lines:

34. Perpendicular lines form 4 right angles:

35. But you only need 1 right angle to know they are Perpendicular Lines:

36. Let’s see what you recall…

37. Linear Pair

38. Adjacent Angles

39. Vertical Angles

40. Angle Bisector B C

41. B C A D

42. Congruent Angles A B

43. Supplementary Angles A B

44. Now Go Practice! The End