Q7 of 22 Page 258

The volume of a metallic cylinder is 748 cm3. If length is 14 cm and its external radius is 9 cm find its thickness?

Let the inner radius be r cm

Given, external radius R = 9 cm


height = 14 cm


volume = 748 cm3


π R2h – π r2h = 748


π (R2 – r2)h = 748





R2 = 64


r = 8 cm


So, thickness = outer radius – inner radius = R – r


thickness = 9 – 8 = 1 cm


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