A hollow cylindrical pipe is 42cm long . its outer and inner diameter are 20cm and 12cm respectively .find the volume of the iron used in making the pipe
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Bhai 42 cm height hai outer d=20/2=10 outer d=10 and inner 12/2=6 inner d =6 Bhai ab csa ka formula me fill krdo alag alag outer ka alag inner ka alag 2prh
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