how many cubic metres of earth must be dug to construct a 20 metre deep well of diameter 7m? the earth take out in spread over a rectangular plot of size 22 x 40 metre find the height of the platform so formed.
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Step-by-step explanation:
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 metres.
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