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Question

What is the volume of material required to make a hollow cylinder having inner and outer radius as 2 cm and 3 cm respectively and height as 14 cm?

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Solution

Given: Inner radius (r1) = 2 cm
Outer radius (r2) = 3 cm
Height (h) = 14 cm

Volume of material required = Volume of hollow cylinder
= outer volume - inner volume
=πr22hπr21h [where r1 and r2 represents inner and outer radius respectively]

=πh(r22r21)

=227×14×[3222]

=227×14×5

=220 cm3


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