The inner diagram of a circular well is 3.5m and it is 12m deep. Find the cost of plastering the inner surface at the rate of rupees 4per m^2
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given :-
inner diameter of the well = 3.5m
➡ it's inner radius = 3.5/2 m
height (depth) of the well = 12m
therefore inner CSA of the well = 2πrh (since Wells are cylindrical)
= 2 × 22/7 × 3.5 × 12
= 22 × 12
= 264m²
hence, cost of plastering it @ of 4 per m² = 264 × 4
= rupees 1056
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