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 Question from Kimberly, a student: I have a tank that is shaped like a cylinder, and it has to hold 2 million gallons of water. There is a height limit of 30 ft. I know the equation is V=pi x r squared x h but I don't know if I need anything For the square foot of water.

Hi Kimberley,

What you are missing is the volume of the tank in cubic feet. Google can help with that. Type 1 gallon in cubic feet into the Google search window and the response is that 1 gallon is 0.133681 cubic feet. How many cubic feet are in 2 million gallons? If the height is 30 feet then you can use the volume formula to solve for $r.$

I hope this helps,
Penny

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