Use an online calculator to enter in the different dimensions to find the volume of a cylinder. You can change values to calculate what size cylinder you need. Take the area of a circle and multiply it by the height.
You can find more information here: csgnetwork.com/volumecalc.html.
To find the volume of a cylinder, multiply the area of the circle (pi times the radius squared) by the height of the cylinder, h. V = pi x r^2 x h.
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