Prime purpose of this article is to Discuss on Volumes of Solids of Revolution. Here explain Volumes of Solids with mathematical theory and examples. Any one can use the definite integral to obtain the volume of a solid that’s obtained by revolving a plane region in regards to horizontal or vertical line it doesn’t pass through the plane. This type of solid will be made up of one of three types of elements—disks, washers, or cylindrical shells—each that requires a different approach in establishing the definite integral to ascertain its volume.