The thickness of a hollow cylinder is 1 cm. It is 7
cm long and its inner radius is 3 cm. The volume
of the wood required to make the cylinder is:
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Answer: r=3cm
h=7 cm
thickness=1cm
volume of wood used =volume of outer cylinder-volume of inner cylinder
=πR1^2h - πR2^2h
=πh(R1^2-R2^2)
= 22/7×7(3^2-2^2)
= 22 ( 9-4)
=22×5
=110cm^3. Answer
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