2. Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation Lesson 9.3 Evaluate Trigonometric Functions of Any Angle Warm-Up Standard Accessed: Students will prove, apply, and model trigonometric functions and ratios.

3. Warm-Up

4. Vocabulary

6. Essential Understandings How can you evaluate trig. functions of any angle?

7. Evaluate trigonometric functions given a point EXAMPLE 1 SOLUTION 41 The value of r must always be positive. T/F

8. Use the Unit Circle EXAMPLE 2 SOLUTION

9. Vocabulary

10. Find the reference angles EXAMPLE 3 SOLUTION Can a reference angle ever have a negative measure? No, a reference angle is an acute angle.

11. Vocabulary CT SA

12. Use reference angles to evaluate functions EXAMPLE 4 SOLUTION Evaluate. What should you do differently when finding the reference angle for an angle measured in radians, rather than degrees?

13. Solve a real – world problem EXAMPLE 5

14. Solve a real – world problem (Using Calculator) EXAMPLE 6

15. Lesson 9.3 Homework: Practice B Practice C “Honors”