Earth dug out on digging a circular tank of diameter 17.5 m is spread all around the tank uniformly to a width of 4 m to from an embankment of height 2 m.Calculate the depth of the circular tank correct upto two decimal places .
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Diameter of circular tank=17.5m
Width of earth embankment=4m
Let it be the depth of the well then volume of earth taken out of