A lead pencil is in the shape of a cylinder. The pencil is 21 cm long with radius 0.4
cm and its lead is of radius 0.1 cm. What is the volume of wood in the pencil?
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Step-by-step explanation:
radius of pencil = 0.4 cm and height of pencil = 21 cm
volume of pencil = π r ^2 h = 22/ 7 x 0.4 x 0.4 x21 = 22 x 4 x 4 x 21/ 7 x 10 x 10 = 1056/100 = 10.56 cm ^3
volume of lead = πr1^2 h = 22/7 x 0.1 x0.1 x 21 = 0.66 cm ^3
volume of wood = 10.56–0.66 = 9.9 cm ^3
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