Lesson Plan from the year 2008 in the subject Mathematics - Geometry, grade: 2,0, Studienseminar Kusel, language: English, abstract: Radatz & Rickmeyer (1991, 7) state that teaching geometry makes an important contribution to the development of the individual child's ability to open up his or her living or experiential environment. Since the abilities that are important for the development of the geometric structure of the environment, such as spatial perception and visual information reception and processing, do not develop on their own, it is necessary to stimulate and promote geometric experiences and exercises in the elementary school age. Especially the application orientation as well as the structure orientation can be realized very well in geometry lessons. The work in the group phase of the present lesson trains basic cognitive skills such as comparing, distinguishing, ordering, sorting, but also social learning is practiced. The concrete action with materials (Radatz & Rickmeyer, 1991, 8) motivates very many students and thus gives them a positive attitude towards the subject mathematics. Radatz & Rickmeyer (1991,10) count among the geometric content areas of elementary school "recognizing, laying out, making, assembling plane figures and shapes such as squares, rectangles, triangles, circles, and distinguishing them according to properties."