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The inner diameter of a circular well is...

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find(i) its inner curved surface area,(ii) the cost of plastering this curved surface at the rate of Rs 40 per `m^2`.

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The correct Answer is:
(i) 110 `m^(2)`
(ii) Rs. 4400
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