1. Radian Measure of a Central Angler r

2. Radian Measure A second way to measure angles is in radians.
Another way of measuring angles
Convenient because major measurements of a circle (circumference, area, etc.) are involve pi
Radians result in easier numbers to use

3. 6.1 Radian and Degree Measure
Radian Measure

4. 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

5. Examples:

6. Ex 5. Convert the degrees to radian measure.
60
30
-54
-118
45

7. Ex 6. Convert the radians to degrees.
a) b) c) d)

8. Class Work Convert from degrees to radians. 54 -300
Convert from radians to degrees. 3. 4.