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"be covered by wrapper, how many square metres of wrapping material will be required?\n[Assume that there is no wastage of material..\nThe inner diameter of a circular well is 3.5\\( \\mathrm { m } \\) . The depth of the well is 15\\( \\mathrm { m } \\) . Find the cost\nof plastering the inner curved surface at the rate of 225 per \\( \\mathrm { m } ^ { 2 } . \\)"

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