Q. 124.6( 5 Votes )

A well is dug 20

Answer :

Given: Height = 20 m


Diameter = 7 m


Length of plot = 22 m


Breadth of plot = 14 m


To find: The height of platform


Formula Used:


Area of rectangle = Length × Breadth


Volume of cylinder = πr2h


Given,


Depth of well = 20m


Diameter of well = 7 m


Radius of well =


Dimension of rectangular field = 22m × 14m


so,


Amount of earth dug out from well = πr2



=770 m3


when this earth is spread on rectangular field:


Volume of the well = Volume of rectangular field


Volume of the well = Area of rectangular field × Height of rectangular field


Then height of platform formed on rectangular field =


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