Volume of solid of revolutions of a function, y=f (x), on an interval [a,b]. When we rotate this curve about a given axis we get the surface of the solid of revolution.
Similarly Disk method. If the axis of revolution is the boundary of the plane region and perpendicular to the axis of revolution. Therefore Solid of revolution. A representative disk is a three- dimensional volume element of a solid of revolution.
Volume of Solid of Revolution
