A basketball is placed inside a cube-shaped box 20 cm by 20 cm by 20 cm. The radius of the basketball is 10 cm. What is the amount of space NOT taken up by the basketball?
Vol of cube = 20^3 = 8000 cm^3 (1)
Vol of sphere = (4/3) pi ( 10)^3 = (4000/3 ) pi cm^3 (2)
To find your answer , subtract ( 2) from (1)
+102 
