A cylindrical metal pipe has the length of 10m. Its inner radius is 55cm and the pipe is
2cm thick. Find the volume of the metal used in the pipe.
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Height of cylinder = 10 m =1000 cm
Inner radius r= 55 cm
Thickness = 2 cm
Outer radius R = 55+2=57 cm
Volume of metal used = Outer volume - Inner volume
Volume of metal used =\pi R^2 h - \pi r^2 hπR
2
h−πr
2
h
Volume of metal used =\frac{22}{7}(57^2-55^2)(1000)
7
22
(57
2
−55
2
)(1000)
Volume of metal used =704000 cm^3704000cm
3
Hence The volume of metal used is 704000 cubic cm
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