Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsA Test for the Convexity of a Quadrilateralhttp://demonstrations.wolfram.com/ATestForTheConvexityOfAQuadrilateral/]]>http://demonstrations.wolfram.com/ATestForTheConvexityOfAQuadrilateral/Polygon Spiralshttp://demonstrations.wolfram.com/PolygonSpirals/]]>http://demonstrations.wolfram.com/PolygonSpirals/Triangle Side Length Inequalityhttp://demonstrations.wolfram.com/TriangleSideLengthInequality/]]>http://demonstrations.wolfram.com/TriangleSideLengthInequality/Volume of Cones, Pyramids, and Sphereshttp://demonstrations.wolfram.com/VolumeOfConesPyramidsAndSpheres/]]>http://demonstrations.wolfram.com/VolumeOfConesPyramidsAndSpheres/Measuring Angles with a Protractorhttp://demonstrations.wolfram.com/MeasuringAnglesWithAProtractor/]]>http://demonstrations.wolfram.com/MeasuringAnglesWithAProtractor/Drawing a Trianglehttp://demonstrations.wolfram.com/DrawingATriangle/]]>http://demonstrations.wolfram.com/DrawingATriangle/Drawing a Colored Polygonhttp://demonstrations.wolfram.com/DrawingAColoredPolygon/]]>http://demonstrations.wolfram.com/DrawingAColoredPolygon/Integer-Sided Triangleshttp://demonstrations.wolfram.com/IntegerSidedTriangles/]]>http://demonstrations.wolfram.com/IntegerSidedTriangles/