Question

A well with 10m inside diameter is dug 8.4m deep

Answer 1

First find the volume of earth(soil) taken out

which is equal to the volume of Cylinder.

Well is on the form of Cylinder, inside diameter

10 m

Radius = 5m

deep/height = 8.4 m

Volume of soil taken out=

As embankment is to be made around the well.

Outside diameter = 10+7.5+7.5= 25 m

Outside radius = 12.5 m

Since ,earth taken out does not put inside the well,so we had to put the formula like

So, the height of the embankment will be 1.6 m.