Learning to conjecture in Geometry with activities such as black box

Abstract

Activities such as black box are those in which a picture made ina dynamic geometry environment is given and the student has toreproduce it, but he is not allowed to see the construction steps, he can only modify the picture in the computer screen by moving its basic points. The aim of this workshop is to present to its participants this type of activity, to discuss the ways to elaborate it and the implications of such an activity for the deductive thinking development in Geometry.