To manipulate the icosahedron above yourself, download the file 'icosahedron.cg3' and open it with the program 'Cabri3D'. If you do not have Cabri 3D you can download a free trial here.Below, you can see a net of an icosahedron, manipulable yourself through thefile icosanet.cg3 also created using Cabri 3D.

Dynamic Icosahedron

The above sketch was created by: Vladimir Dubrovsky (, Kolmogorov School of Moscow State University, 2003. Download the file icosahedron.gsp using The Geometer's Sketchpad. If you are a teacher and do not have The Geometer's Sketchpad you can download a free trial from here.

Please note that this site uses Flash Player to display moving images.  If you can't see the moving images you may not have the Flash Player plug-in installed on your computer.  To install the Flash Player please go to