A-didactic situations for the theaching of axial symmetry by using cabri as a means

Abstract

We present the first activity of a didactic engineering using the Theory of Didactic Situations for the design and experimentation of a-didactic situations with Cabri as ‘milieu’. The activity’s a priori and a posteriori analyses show that the interaction with the ‘milieu’ led students to the construction of intuitive knowledge about reflection.