The inner diameter of a circular well...

The inner diameter of a circular well is 3.5m. It is 10m deep find: inner curved surface area. the cost of plastering this curved surface at the rate of Rs. `40\ p e r\ m^2dot`

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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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