1. 9.3B Notes: Angle conversions

2. Radian measure has to do with circles and their circumference
Radian measure has to do with circles and their circumference. They involve π.
360° = full circle = 2π radians
180° = half circle = π radians
Radian measure

3. Conversion factors: Degrees to radians: multiply degree by
Radians to degrees: multiply radian measure by
Conversion factors:

4. Let’s try it!!! EX1: 125° EX 2: - EX 3: 135° EX 4: -50° EX 5: EX 6:

5. So, can we find coterminal angles too?
Of course  Let’s fill in the circle with radian measure:
Draw the angle, state the quadrant of it’s terminal side, find one positive and one negative coterminal angle measure.
EX 8) EX 9)
So, can we find coterminal angles too?