1. Grade Homework
HW 13.2A Answers

4. 13.2B General Angles and Radian Measure
Objective
Students will be able to draw the terminal side of an angle in standard form given a radian measure. Students will be able to determine co-terminal angles given a radian measure

5. 6.1 Radian and Degree Measure
Radian Measure
A second way to measure angles is in radians.
Definition of Radian:
One radian is the measure of a central angle  that intercepts arc s equal in length to the radius r of the circle.
In general,

6. 6.1 Radian and Degree Measure
Radian Measure

7. 6.1 Radian and Degree Measure
Radian Measure

8. 6.1 Radian and Degree Measure
Conversions Between Degrees and Radians
To convert degrees to radians, multiply degrees by
To convert radians to degrees, multiply radians by

9. Ex 5. Convert the degrees to radian measure.
60
b) -54
c) 45

10. PRACTICE Convert the degrees to radian measure. YOU TRY!

11. Ex 6. Convert the radians to degrees.
a) b)

12. Ex 6. Convert the radians to degrees. YOU TRY!
c) d)

13. Degree and Radian Form of “Special” Angles
0° 
360 ° 
30 ° 
45 ° 
60 ° 
330 ° 
315 ° 
300 ° 
 120 °
 135 °
 150 °
 240 °
 225 °
 210 °
 180 °
90 ° 
270 °  
Degree and Radian Form of “Special” Angles

14. Ex 7. Find one positive and one negative angle that is coterminal with the angle  = in standard position.

15. Ex 8. Find one positive and one negative angle that is coterminal with the angle  = in standard position.

16. YOU TRY! Find one postive angle and one negative angle in
standard position that are coterminal with the
given angle.

17. Algebra 2 Homework: 13.2B
1. In your own words, describe what a radian is.