1. Warm-Up 10/15 1. H PSAT Tomorrow 10/16, you will need to bring your own calculator.

3. Rigor: You will learn how to use the Law of Sines and Cosines to solve right triangle problems. Relevance: You will be able to use the Law of Sines and Cosines to solve real world problems.

4. 4-7b Law of Sines and the Law of Cosines

5. Cases: 1 ASA or SAA 2 SSA 3SAS 4SSS LAW OF SINES LAW OF COSINES

7. Example 4: Find two triangles for which A = 43°, a = 25, b = 28. Round side lengths to the nearest tenth and angle measures to the nearest degree. Solution 2: Find the obtuse  B'.  CB'B =  B

8. Law of Cosines:

9. Example 5: Solve ∆ABC. Round side lengths to the nearest tenth and angle measures to the nearest degree. Given a = 6, b =24, c = 20 find angle A.

10. Example 6: Solve ∆ABC. Round side lengths to the nearest tenth and angle measures to the nearest degree.

11. Law of Cosines:

12. Heron’s Formula: SSS

13. Example 7: Find the area of ∆XYZ.

15. Example 8: Find the area of ∆GHJ to the nearest tenth.

16. math! 4-7a Assignment: TX p298, 2-24 even Unit 4 Test Monday 10/21

17. math! 4-7a Assignment: TX p298, 2-24 even Assignment for Wednesday: 4-7b Assignment: TX p298-299, 26-50 even Unit 4 Test Monday 10/21