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15. A hollow cylindrical tube open at both ends is made of iron 3cm thick .if the external diameter be 56cm and the length of the tube be 182cm,find the number of cubic cm in it .

Answer» 15. A hollow cylindrical tube open at both ends is made of iron 3cm thick .if the external diameter be 56cm and the length of the tube be 182cm,find the number of cubic cm in it .


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