Question

a well of diameter 4cm is dug 20 cm deep the mud taken out is spread evenly around the well to form a 16cm high embankment , find the thickness of embankment​

Answer 1

Given,

Diameter =4 m

Radius =2 m

h=21 m

V=π r raise to 2

h=π(2)(2)(21)=84π

Volume of soil dug from well = volume of earth used to form embankment

⇒84π=π(5 raise to2−2 raise to2)h

h= 84/25−4

= 84/21

=4m

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