Question 272686
A boat is 1000 meters from a cliff. If the angle of depression from the top of the cliff to the boat is 15 degrees, how tall is the cliff?

Angle of depression = 15 degrees

The sides containing the right angle 
One side is the distance and the other side is the height

Tan 15 = height / distance from cliff

tan 15 = height / 1000

Height = 1000 * tan 15
  =  1000 * 0.8559

855.9 meters is the height