1. Warm-Up 3/26 Fahrenheit

3. Rigor: You will learn how to convert from degrees to radians and radians to degrees. Relevance: You will be able to solve real world right triangle trigonometry problems using degrees and radians.

4. Trig 2: Degrees and Radians

5. Angle Starting position Position after rotation

6. counterclockwise clockwise

7. The most common angular unit of measure is the degree. 1° is formed by rotating the initial side of a complete revolution. Angle Measure: amount of rotation about vertex needed to “open” rays.

9. Conversions: Radians to Degrees: Multiply by Degrees to Radians: Multiply by

10. Example 1: Convert From Degrees to Radians. = 120° a. 120° b. – 45  = – 45°

11. Example 2: Convert From Radians to Degrees. a. b.

12. Coterminal Angles Degrees All angles  + 360n  Radians All angles  + 2n 

13. Example 3a: Find all angles and draw 2 Coterminal Angles. a. 45° 45  + 360  = 405  45  – 360  = – 315  All Angles: 45  + 360 n 

14. Example 3b: Find all angles and draw 2 Coterminal Angles. b.

15. Assignment 4-2 Worksheet 1-15 all