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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Radius (r1) of pencil == 0.35 cm Radius (r2) of graphite = = 0.05 cm Height (h) of pencil = 14 cm Volume of wood in pencil =
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Radius (r1) of pencil == 0.35 cm Radius (r2) of graphite == 0.05 cm Height (h) of pencil = 14 cm Volume of wood in pencil = read less
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The circumference of the base of a cylindrical vessel is 132 cm and its height is 25 cm. How many litres of water can it hold? (1000  = 1l)

Let the radius of the cylindrical vessel be r. Height (h) of vessel = 25 cm Circumference of vessel = 132 cm 2πr = 132 cm Volume of cylindrical vessel = πr2h = 34650 cm3 = 34.65 litres Therefore, such vessel can hold 34.65 litres of water.
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