There are different formulae for different shapes so you would need to specify the shape in order to get an answer.
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Volume=length x width x height (V=lwh)
No matter what you're finding, use the equation V=πr2h. Then solve algebraically. V=volume h=height r=radius πr2=area of the base
Use the equation for the volume of a cone, replace the known height and volume, and solve the resulting equation for the radius.
Volume.
For finding accurate volume of a pencil use a vernier calliper, which measures diameter up to two significant figures. For finding volume of a pencil you will need radius (r) and length (L) of the pencil. V = 3.14 r²L