Question 132929
You are 20 feet away from a wall 15 feet hit. Assuming the wall is vertical, you can obtain the angle at point o (below) by using tangent.

Tangent is {{{opposite/ajacent}}}

|
|(15)
|
-----(20)---o

tangent = 15/20 = 0.75

use your calculator to find the Tan-1(.75) -- 36.86 degrees