For finding the volume of a cylinder ..
The equation 'πR^2h' must be used....
here from the equation πR^2h
R = radius of the cylinder
H = height of the cylinder
...for example..
if radius(R) of the cylinder is 2..and height(H) is 10
volume =πR^2h
=πx2x2x10
=40π
=40x3.141
=52.56