## 5 Triangle Trigonometry

**Chapter Outline**

**5.1** Right Triangle Trigonometry

**5.2** Applications of Right Triangles

**5.3** Law of Sines

**5.4** Law of Cosines

**5.5** Vectors and Dot Product

Chapter 5 Review Exercises

**5.1 Right Triangle Trigonometry**

**Introduction** The word *trigonometry* (from the Greek *trigonon* meaning “triangle” and *metria* meaning “measurement”) refers to the measurement of triangles. In Section 4.2 we defined the trigonometric functions using coordinates of points on the unit circle and by using radian measure we were able to define the trigonometric ...