1. Introduction to Trig Unit Unit Circle And Radians

2. Diagrams page 448 AFM book

3. Unit Circle unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean planeCartesian coordinate systemEuclidean plane

4. Other descriptions of radians Radian - Wikipedia, the free encyclopedia Radian -- from Wolfram MathWorld

5. Definition for Radian You need to know for precalculus Is a central angle whose intercepted arc has length the radius of the circle

6. Definition of Pi Need to know for precalculus Is the circumference of a circle divided by its diameter.

7. Radians On the unit circle, the angles are given in degrees. Another way to measure an angle is with radians. It is like Fahrenheit and Celsius to measure temperature. 2π radians = 360° one complete rotation around the circle 1π radians = 180° a half a rotation π/2 radians = 90° a fourth of a rotation

8. Convert from Degree to Radians From degrees to radians Multiply by Reduce the fraction Example:Convert 90° to radians

9. Convert Radians to Degrees From Radians to Degrees Multiply by And Reduce the fraction Example Convert 3π/2 to decimal

10. These techniques Are very important and will be used throughout our study of trigonometry. So practice will make perfect!

11. Here is where we are going