Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsLength of the Projection of a Rotating Polygonhttp://demonstrations.wolfram.com/LengthOfTheProjectionOfARotatingPolygon/]]>http://demonstrations.wolfram.com/LengthOfTheProjectionOfARotatingPolygon/