Question

How many cubic metres of earth must be dug out to sink a well 22.5 m Deep and of diameter 7 m? also find the cost of clustering the inner curved surface at Rest. 3 per square metre

Answer 1

Volume of earth to be dug = Volume of well

={22}{7} x{7}{2} x{7}{2} x {22.5m}^{3} = {866.25m}^{3}
Area of the inner curved surface

= 2πrh = 2 x{22}{7} x{7}{2} x {22.5m}^{2} = {495m}^{2}

Hence.. Cost of plastering the inner curved surface =R
Rs(495x3) = Rs 1485.

Answer 2

Step-by-step explanation:

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