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in Mathematics by (53.9k points)

A hollow cylindrical pipe is made up of copper It is 21 dm long, the outer and inner diameters of the pipe are 10 cm and 6 cm respectively, find the volume of copper used in making the pipe.

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Best answer

Height of cylindrical pipe h = 21 dm

Volume of copper in making the pipe = ( volume of external cylinder) - volume of internal cylinder)

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