Q. 74.3( 207 Votes )

The inner diamete

Answer :

Inner diameter of the circular well = 3.5 m
Inner radius (r) of circular well = Diameter/ 2=  m

= 1.75 m

Depth (h) of circular well = 10 m


(i) Inner curved surface area = 2πrh


= 2 x  x 1.75 x 10 m2


= (44 × 0.25 × 10) m2


= 110 m2


Therefore, the inner curved surface area of the circular well is 110 m2.


(ii) Cost of plastering 1 m2 area = Rs 40


Cost of plastering 110 m2 area = Rs (110 × 40)


= Rs 4400


Therefore, the cost of plastering the CSA of this well is Rs 4400.

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