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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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Diameter of pencil, d = 7 mm = 0.7 m.

length of pencil, h = 14 cm 

diameter of pencil, d = 1 mm = 0.1 cm

Volume of wood in pencil, V

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