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which is
If you want an expression for the volume of liquid in the tank as a function of the depth d at the centre you can extract that from the response that Stephen gave to a similar question by Andy. Andy's tank had a radius of 5 feet and a length of 35 feet. If you have a tank of radius r feet and height h feet then tracing through Stephens development you find that the volume at a depth of d feet (d less than r) is
Make sure that when you use cos^{1} on your calculator that it is set in radian mode and not degree mode. I hope this helps,
 


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