Q. 115.0( 3 Votes )

Find the cost of plastering the inner surface of a well at Rs. 9.50 per m2, if it is 21 m deep and diamwter of its top is 6 m.

Answer :


Height of cylinder = 21 m

Diameter of cylinder = 6 m

Radius of cylinder =


Curved surface area of cylinder =

Cost of plastering the inner surface at rate Rs.9.50 per m2 = 396×9.50 = Rs.3762

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