her diameters are 10 cm andHence, thickness of the pipeEXAMPLE 15 A ho – InterviewSolution

1.	her diameters are 10 cm andHence, thickness of the pipeEXAMPLE 15 A hollow cylindrical pipe is 21 dm long. Its outer and inner diameter6 cm respectively. Find the volume of the copper used in making the pipe.
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