SOLUTION: If a metal pipe 10m long has an external diameter of 12cm and a thickness of 1cm, find the volume of the metal used in making the pipe

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Question 1050525: If a metal pipe 10m long has an external diameter of 12cm and a thickness of 1cm, find the volume of the metal used in making the pipe
Answer by ikleyn(52803) About Me  (Show Source):
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If a metal pipe 10m long has an external diameter of 12cm and a thickness of 1cm, find the volume of the metal used in making the pipe
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Outer radius is 12%2F2 = 6 cm.

Inner radius is 6 - 1 = 5 cm.

The volume of the metal is the difference of volumes of two cylinders

V = pi%2A6%5E2%2A1000+-+pi%2A5%5E2%2A1000 = pi%2A1000%2A%2836-25%29 = 1000%2Api%2A11 cm%5E3.


Here 1000 = 1000 cm = 10 m.