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I have a trough which is a circular container. How do I determine how many gallons of water it takes to fill up the trough? I was thinking that we measure the height and the width but I think it's a bit different with a cylinder. What's the formula?

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    The volume of a right cylinder is given by $V=\pi r^2 h$, where $r$ is the radius of the base/top and $h$ is the height/length of the cylinder.2011-06-23

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