Volumes of Solids of Revolution: Shell Method

http://demonstrations.wolfram.com/Vol... The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. The volume of a solid of revolution can be approximated using the volumes of concentric cylindrical shells. Choose between rotating around the y axis or the x axis. Move the sliders to change the space between cylinders and to see the solid emerge. Contributed by: Helen Papadopoulos