1. Topic 11-2 Radian Measure

2. Definition of a Radian Radian is the measure of the arc of a unit circle. Unit circle is a circle with a radius of 1.

3. Arc Length In geometry, an arc length is represented by “s” If any of these parts are unknown, use the formula r r s θ Where theta is in radians

4. Arc Length in Radians What is the arc length s to the nearest tenth?

5. Conversions Between Degrees and Radians 1.To convert degrees to radians, multiply degrees by 2. To convert radians to degrees, multiply radians by

6. Ex 5. Convert the degrees to radian measure. a) 60  b) 30  c)-54  d)-118  e) 45 

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