# Chapter 3

## Probability and Trigonometry

### Section 3.1

Section 3.1

**You will learn several ways to model situations involving probability, such as tree diagrams and area models. You will formalize methods for computing probabilities of unions, intersections, and complements of events. Then you will calculate expected value in games of chance.**

- 3.1.1 Using an Area Model (301)
- 3.1.2 Using a Tree Diagram (310)
- 3.1.3 Probability Models (319)
- 3.1.4 Unions, Intersections, and Complements (330)
- 3.1.5 Expected Value (341)

### Section 3.2

Section 3.2

**You will investigate the relationship between the slope of a line and the slope angle. You will use the concept of slope ratio to determine missing measurements of a right triangle and solve everyday problems.**

- 3.2.1 Constant Ratios in Right Triangles (354)
- 3.2.2 Connecting Slope Ratios to Specific Angles (365)
- 3.2.3 Expanding the Trig Table (374)
- 3.2.4 The Tangent Ratio (381)
- 3.2.5 Applying the Tangent Ratio (389)