please help me guys
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volume of a cylindrical pipe is given by π * (ro^2-ri^2) * h,
=> 748 = π *(9^2-ri^2)*14,
=> 17 = 81-ri^2,
=> ri^2 = 64,
=> ri = 8 cm.
therefore, thickness of pipe is 14-8 =6mm.
hope it helps u ...
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