The tank is a cylinder. The volume formula for a cylinder is V=pir^2h. So plug in the information. V= (3.14)(12^2)(30) 12 squared or 12x12 is 144. V=(3.14)(144)(30) Multiply the 3 numbers. 13,564.8 is the product. So the volume of the Cylindrical tank is 13,564.8. If you are still don't understand I can help more:)
