how many cubic meters of earth must be dug out to sink a well which is 20m deep and has a diameter of 7meters?if the earth so dug out is spread over a rectangular plot 28m by 11m what is the height of platform so formed.
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Volume of cylinder = 22/7 r*r*h
Height =20m
Diameter =7m
radius=7/2 =3.5
Volume = 22/7 *3.5*3.5*20
=770 cu cm
Area of rectangle = l*b
Area of the rectangular plot = 28 * 11
=308 sq m
Height = volume / l*b
=770/308
=2.5m
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