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A lead pencil consists of a cylinder of wood with a solid cylinder of graphite filled in the interior. The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm. If the length of the pencil is 14 cm, find the volume of the wood and that of the graphite.

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Volume of graphite=`pir^2h`
=`22/7*(1/4)^2 140`
=`110mm^2`
Total volume=`piR^2h`
=`22/7*(7/2)^2*140`
=`5390mm^2`
Volume of wood=total volume-volume of sphere
=5340-110mm^3
=`5280mm^3`.

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