http://demonstrations.wolfram.com/VolumesOfSolidsOfRevolutionShellMethod/
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
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