Q13 of 62 Page 22

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find the cost of plastering its inner curved surface at Rs. 4 per square metre.

Given,


Inner diameter of circular well = 3.5 m


Radius of well =


Height of well = 10 m


So,


Curved surface area of well =


∴ Cost of plastering its inner curved surface at rate Rs. 4 per m2 = 110 ×4 = Rs. 440


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