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. Complementary How 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. Review
Complementary angles are…….

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 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