in October during mathematics classes in Grade C9, we dealt with geometry. With the learning of new concepts, we also revised the techniques for creating presentations, the skills necessary for team work, and the ways of oral presentation of the results that we had obtained. Each student had the opportunity, in front of the class, to present a lesson of their choice. The approaches were different, more or less interesting, but always creative. In mastering the content, we used wooden and wired models, pictures, cardboard nets, toys, handouts... We saw that when we put effort in our work, research and learning of mathematics can be fun.