1. Welcome to Alg. 2A w
3 m
ke i+ c
unt

2. Today’s agenda Warm-up Homework Questions?? 13.1B Notes
Assignment: Skills Practice 2

3. Warm-up

4. I can . . .
solve equations involving inverse trigonometric functions.
solve problems involving right angles.
Lesson 13.1a

5. Example 7:
Solve ABC. Round measures of sides to the nearest tenth and measures of angles to the nearest degree. (Find all missing angles & sides.)
Find A:
Find B: H O
32 A
Example 1-4a

6. Example 8:
Solve ABC. Round measures of sides to the nearest tenth and measures of angles to the nearest degree. (Find all missing angles & sides.)
Find A:
Find B: O H
30 A
Example 1-4a

7. Angles of elevation & depression
Angle of Depression θº
Angle of Elevation θº

8. Example 9:
Bridge Construction: In order to construct a bridge across a river, the width of the river must be determined. A stake is planted on one side of the river directly across from a second stake on the opposite side. At a distance 30 meters to the left of the stake, an angle of 55 is measured between the two stakes. Find the width of the river. 1 O A

9. Example 10:
Skiing: A run has an angle of elevation of 15.7 and a vertical drop of 1800 feet. Estimate the length of this run. 1 H O

10. Today’s assignment
13.1 Skills Practice
#7 - 10