A pile of sand at a concrete plant is a cone shape. It is 15 meters high, and the circular base has a diameter of 40 meters. What is the volume of this sand, in cubic meters?
The radius of the circular base is 40 meters / 2 = <<40/2=20>>20 meters.
The volume of the cone is (1/3) * pi * r^2 * h = (1/3) * pi * 20^2 * 15 = (1/3) * 3.14 * 20^2 * 15 = 12560 cubic meters. Answer: \boxed{12560}.