Find The Volume Of The Moon, Which Has A Diameter Of 2160 Miles?

(4/3)pi*r^3    (formula for the volume of a sphere)
  = (4/3)pi*(2160/2 mi)^3
  = (pi/6)*(2.16*10^3 mi)^3
  = (pi/6)*10.077696*10^9 mi^3
  ≈ 5.28*10^9 mi^3   (3 significant figures, as is the diameter data)