1. 9-3 Angles of Elevation and Depression
Two Key Terms

2. Vocabulary Angle of Depression and Angle of Elevation are Equal
Horizontal Line
Angle of Depression
Angle of Elevation
Horizontal Line

3. #1 Identifying Angles of Elevation and Depression

4. #2 Real-World Connection
You sight a rock climber on a cliff at a 32o angle of elevation. The horizontal ground distance to the cliff is 1000 ft. Find the line of sight distance to the rock climber. x
1000 ft

5. #3 Real-World Connection
An airplane pilots sights a life raft at a 26o angle of depression. The airplane’s altitude is 3 km. What is the airplane’s surface distance d from the raft?
3 km d

6. Example 3: d = m – n 35 36 d 154 m n 36 35 m
Vernon is on the top dock of a cruise ship and observes two dolphins following each other directly away from the ship in a straight line. Vernon’s position is 154 meters above sea level, and the angles of depression to the two dolphins are 35 and Find the distance between the two dolphins to the nearest meter.
154 m
35
36 d
d = m – n n
36
35 m