Solve the following problem. Be sure to make a diagram of the situation with all the given information labeled A person standing on top of a 20-foot high sand pile wishes to estimate the width of the pile. He visually locates two rocks on the ground below at the base of the sand sides of the sand pile, and he and the two rocks are in the same vertical plane. If the angles of depression from the top of the sand pile to each of the rocks are 21 an rocks? (Round your answer to the nearest whole number.) ft