Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsRotation about a Point in the Planehttp://demonstrations.wolfram.com/RotationAboutAPointInThePlane/]]>http://demonstrations.wolfram.com/RotationAboutAPointInThePlane/