9-3 Angles of Elevation and Depression Two Key Terms

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

#1 Identifying Angles of Elevation and Depression

#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

#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

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 36 . Find the distance between the two dolphins to the nearest meter. 154 m 35 36 d d = m – n n 36 35 m