1. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. Warm up 1. Solve the triangle 10.3 Extending the Trigonometric Ratios A 12 C 15 c B

2. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. Section 10-3 Reciprocal Trig Ratios

3. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. 1. Sketch 150°

4. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. 2. Sketch 210°

5. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. Reciprocal Trig Function 10.3 Extending the Trigonometric Ratios

6. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. 3. Find sec A B 3 C 7 11 A

7. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. 10.3 Extending the Trigonometric Ratios Definitions Unit Circle Definition of Sine and Cosine: Let  be a rotational angle. Then sin  is the y-coordinate of the image of the point P(1, 0) rotated  ° about the origin, and cos  is the x-coordinate. θ

8. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. 10.3 Extending the Trigonometric Ratios 4. Find the coordinates of point P on the unit circle. Point P has coordinates (cos 120 , sin 120  )  (–0.5, 0.8660).

9. Copyright © by Holt, Rinehart and Winston. All Rights Reserved. Assignment Enrichment 8-5 and page 652 # 13-32 # 21-28 are graphs and # 29 – 32 are find sine and cosine