Geometry
posted by hope .
A man is sitting by a pool. He looks up at an angle of elevation of 18 degrees at a bird in a nest at the top of a tall tree. Since the man is 200 feet from the bird's tree. How tall is the tree?

looks like simple tangent
tan 18° = height/200
height = 200tan18° = 64.98 or appr 65 ft