Volume of Sphere is V=(4/3)*PI*r^3 The radius of the volleyball is 13 inches So V=(4/3) * 3.14 * 13^3 = 9198 cubic inches
Volume of a cylinder is V=pi * r^2 *h Since they say the ball fits perfectly The radius is 13 and the height is 26 ( the diameter of the ball) So V=3.14 * 13^2 * 26 = 13,797 cubic inches