Etude expérimentale avec Cabri3d de la généralisation à l′espace d′un probléme de géométrie plane

摘要

We present an experimental study of a problem about the pedal tetrahedron, using the software Cabri3d. We describe a ‘point detector' device to draw approximations of loci, and we use these approximations to deduce properties of these loci and construct them exactly. Finally, we give the proofs of the theorems proposed.? Keywords: ?dynamical geometry in space, Cabri3d, point detector.?