Volume of a Sphere Word Problems Worksheet - onlinemath4all Step 1 : Because soccer ball is in the shape of sphere, we can use the formula of volume of a sphere to find volume of the soccer ball. Write the formula to find volume of a sphere. V = 4/3 · πr3 ----- (1) Step 2 : To find the volume, we need the radius of the sphere. But, the diameter is given, that is 24 cm. So, find the radius.