Pi x r² x h
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V=hπr2
The volume of a right circular cylinder with a diameter of 6.8 in and a height of 2 feet is: 871.6 cubic inches.
Pi x r2 x h
First, it is not an approximation but the formula for the exact value of the volume. Second, pi and e are quite different numbers.
The formula to find the volume of a right cylinder is height times area of the circular base. This volume in cubic feet is then multiplied by 7.48 to find the number of gallons.