Hello,
Enclosed a snaphot of the Gougu puzzle to demonstrate the Pythagorean theorem. The construction is done with DrGeo, and the tiles of the puzzle are simulated with the translation transformation of polygons.
A project file can be downloaded from our swiki at http://swiki.ofset.org:8000/super/320 However, your image need to be installed with DrGeo, in case of doubt you can just download a Squeakland image preloaded with DrGeo (See http://wiki.laptop.org/go/DrGeo).
I have also recorded two videos to show the dynamic of the project: http://squeak.ofset.org/drgeo/Gougu1.ogg http://squeak.ofset.org/drgeo/Gougu2.ogg
I am pretty sure it can be extended/modified for projects with students.
Hilaire
squeakland@lists.squeakfoundation.org