Right Triangle Problem with Trigonometry?

Question

A security camera in a neighborhood bank is mounted on a wall 9 ft above the floor. What angle of depression should be used if the camera is to be directed to a spot 6 ft. above the floor and 12 ft. from the wall.

Answer 1

-75.96° (See diagram below):

http://i533.photobucket.com/albums/ee339...

Answer 2

use a geometry set to get your answer.