An eagle 300ft. in the air spots its prey on the ground. The angle of depression to its prey is 15 degrees. What is the horizontal distance between the eagle and its prey?
The vertical distance 300ft and the horizontal distance are the legs of a right traingle
the tangent of the 15o = opp/adj = 300/horiz horiz is what you are looking for
tan 15 = 300/horiz solve for horiz