Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsCavalieri's Principlehttp://demonstrations.wolfram.com/CavalierisPrinciple/]]>http://demonstrations.wolfram.com/CavalierisPrinciple/The Disk Methodhttp://demonstrations.wolfram.com/TheDiskMethod/]]>http://demonstrations.wolfram.com/TheDiskMethod/Solid of Revolutionhttp://demonstrations.wolfram.com/SolidOfRevolution/]]>http://demonstrations.wolfram.com/SolidOfRevolution/