A person is standing on a tower which is 5 m high from his eye sight and is looking at the ball down, the angle of depression is 18°. Find how far is the ball from the tower.

Answer 1

Did you draw a diagram?
Now review your basic trig functions, and (if I parse your mangled lanugage correctly) you can see that the distance x from the tower can be found using
x/5 = tan 18°
Now the trig is done -- the rest is just Algebra I

Answer 2

Tan18 = 5/x
X = 15.4 m.

Answer 3

dang - saved by henry2