What is the formula we use for embankment?
embankment is nothing but a type of ring, so find its area is soo easy;
AREA OF OUTER CIRCLE-AREA OF INNER CIRCLE *HEIGHT
22/7*R2-22/7*r2*h
i.e, 22/7*(R2- r2)*h
AREA OF OUTER CIRCLE-AREA OF INNER CIRCLE *HEIGHT
22/7*R2-22/7*r2*h
i.e, 22/7*(R2- r2)*h