How many cubic metres of earth must be dug to construct a 20-m-deep well of diameter 7 m? If the earth taken out is spread over a rectangular plot of size 22 m x 14 m, find the height of the platform so formed.
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We have the diameter of the well = 7m. Hence the radius of the well = 3.5m. Depth of the well = h = 20m. Hence the volume of the earth removed by digging =πr2h=227×(3.5)2×20=770 cubic metre
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answer is 770
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