Module 5-I – Review of Triangle Trigonometry

Section 5-I.5 -Law of Sines and Law of Cosines

Introduction

 In previous sections you have learned how to use trig ratios to help solve some geometric problems involving right angled triangles. Now we’ll consider some methods that work also for more general triangles.

What to Do

1.         Read section 7.1 of the text. On your first reading of section 7.1, skip from the end of Example 1  directly to Example 4. After reading section 7.1 try Exercise #17, and check your answer (and if necessary refer to the student solutions manual to see how it’s done).

2.         Read section 7.2 up to the end of Example 6. (You can also read the rest if you like but you will not be expected to remember it). Try Exercise #13 if you want to see an applied example (and check the solutions manual if you have difficulty).

3.         Read the  Summary Notes and Discussion for this section, and

4.         Follow the instructions regarding Further Practice until you have achieved the Learning Objectives for this section.