Kadin makes a snowman by stacking snowballs of radius 2 inches, 3 inches, and 6 inches. Assuming all his snowballs are spherical, what is the total volume of snow he uses, in cubic inches? Express your answer in terms of pi .
Volume of a sphere = 4/3 pi r3
4/3 pi ( 23 + 33 + 63) = 334.67 pi in3