The frustrum of a cone is a solid
figure formed from a cone by removing a slice at the top parallel to the
base.
The volume of this object can be found by subtracting the volume of
the missing slice from the original total volume.
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Suppose the original cone had a height of
h1 and radius r1. Suppose the removed cone had a height
of h2 and radius r2, then the required volume is
If r2 is known then h2 can be calculated
from it using similar triangles.
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