Question

how many cubic meters of earth must be dug out to sink a well which is 20m deep and has a diameter of 7m? if the earth so dugout is spread out over a rectangle plot (14*11m) what will be the height of the platforms so formed?

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Answer 1

Answer:

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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