The inner diameter of a circular well is 3.5m. It is 10m 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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i) The inner curved surface area of the well = 2πrh
= 2 × 22/7 × 1.75 m × 10 m
= 110 m²
ii) We can calculate the cost of plastering by multiplying the curved surface area of the well and the rate of plastering per square meter.
Cost of plastering the curved surface area at ₹ 40 per m2 = 110 × 40 = ₹ 4400
Thus, the inner curved surface area is 110 m² and the cost of plastering the circular well is ₹ 4400.
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