Deltoids like kites. A travel through geometry

Abstract

This work presents a plan geometry learning unit that highlights the deltoid, a figure often neglected in the classrooms. The proposed methodology is active and operative, employing both artifacts (“dynamic models”) built by the students and geometrical software (Cabri, Geogebra). The theoretical reference framework and the mathematical knowledge that can be gained from the suggested activities are explained and instructions on the organization and the activities management in the classroom are provided together with their educative and cognitive value.