The Formula can be easily derived by taking a look at the volume of a right cylinder.
Since a cylinder's V=pi*radius''*height, then a barrels would equal volume = h * Pi * (2r12 + r22) / 3 because of the middle base and the top and bottom bases.
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The formula of volume
Volume = Length * Width * Height
The formula will depend on what it is that you are trying to find: the volume or the surface area.
irrgular hexgonal formula
Assuming that the ball is spherical in shape, the volume of a sphere is given by the formula(4/3)(pi)(radius)3 cubic unitsSource: www.icoachmath.com