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A hollow cylindrical pipe is 21 dm long. Its outer and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making t

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A hollow cylindrical pipe is 21 dm long. Its outer and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making the pipe.
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Volume of copper=Volume of outer cylinder-volume of inner cylinder.
`=piR^2h-pir^2h`
`=pih(R^2-r^2)`
`=22/7*210*16*4`
`=42240cm^3`.
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