Angles and Rays

1. Angles and Rays

2. Let’s review first • What is this? Ray

3. What is this called? Angle

4. What are these called? 1 Sides 2

5. A Ray B C Ray The above angle is named: ABC CBA B

6. What is this called? Ray Ray Vertex

7. OBTUSE ANGLE What type of angle is this? X O B

8. RIGHT ANGLE What type of angle is this?

9. ACUTE ANGLE What type of angle is this? X Z Y

10. RIGHT ANGLE What type of angle is this? A C B

11. What type of angle is this? OBTUSE ANGLE D B M

12. What type of angle is this? ACUTE ANGLE X Z Y

13. Turn to page 37 in your math book • Take the next three minutes to complete numbers 1 -20 on your own. • Write acute, right or obtuse.

14. Check your answers! • 1. Acute 11. Acute • 2. Obtuse 12. Right • 3. Obtuse 13. Acute • 4. Right 14. Obtuse • 5. Acute 15. Acute • 6. Acute 16. Acute • 7. Acute 17. Obtuse • 8. Acute 18. Acute • 9. Obtuse 19. Acute • 10. Right 20. Right

15. Types of Angles • Narrow Skinny X Z Y The area between the two rays on an acute angle is narrow.

16. Types of Angles • Wide Fatter D B The area between the two rays on an obtuse angle is wide. M

17. Lets look at page 38 together. • 1. The narrowest kind of angle is a(n) ____________________ angle. Obtuse Acute Right

18. Lets look at page 38 together. • 2. A(n) ____________________ angle is wider than an acute angle, but narrower than an obtuse angle. Obtuse Acute Right

19. Lets look at page 38 together. • 3. A(n) ____________________ angle is wider than a right angle, but narrower than a straight angle. Obtuse Acute Right

20. Lets look at page 38 together. • 4. A(n) ____________________ angle is the widest of these kinds of angles. Straight angle

21. Lets look at page 38 together. • 5. Underline the correct answer. • An (acute, obtuse ) angle is wider than a right angle.

22. Homework • Draw each of the four types of angles we just talked about in class and label them.