Idk what to do, I made a triangle for the problem, but when it came to angle of elevation im clueless...help?

The rim of a basketball hoop is 10ft above the ground. The free-throw line is 15 feet from the basket rim. If the eyes are of a basketball player are 6 feet above the ground, what is the angle of elevation of the players line of sight when shooting a free throw to the rim of a basket?

http://i20.photobucket.com/albums/b2..._188/math2.jpg