1. We measure angles with a protractor.
Measuring Angles
We measure angles with a protractor.

2. Finding Angle Measures: What is measure of DOG
Center of protractor
Ray DO is at 0° D O
Line up angle vertex with center of protractor; have one side at 0°

3. Look at where non-zeroed ray crosses……..G D O
Approximately 34°

4. What is the angle measure?D O
Approximately 80°

5. What is the angle measure?D O
Approximately 132°

6. What is the angle measure?D O
90°

7. What is the angle measure?O D
179°

8. What is the angle measure?D O
Approximately 6°

9. Drawing Angles
1. Draw a ray.

10. Drawing Angles
2. Line up protractor with rays endpoint; have ray pointing to zero degrees.

11. Drawing Angles
2. Put point at desired angle. Let’s make a 40° angle.

12. Drawing Angles
3. Draw ray from endpoint of first ray though second point.

13. Draw a 75 degree angle.

14. Draw a 100 degree angle.

15. Draw a 163 degree angle.

16. Draw a 32 degree angle.