The diploma thesis is about teaching geometry with the help of circular geoboards. Nowadays geoboards are used mostly at primary level of education, and only rarely in the lower secondary level. Furthermore, almost exclusively square geoboards are used, and not the circular geoboards, which are considered in the thesis. In the theoretical part of the thesis I thus consider how to incorporate circular geoboard in mathematics classes at lower secondary level. I relate the geoboard with van Hiele’s doctrine and Bruner’s classification of representations. I consider the circular geoboard also as a means for mathematical investigations using the Frobisher’s schema of investigation. The empirical part of the thesis is based on a pilot research. The aim of the research was to show that students with learning difficulties obtain better learning outcomes if they learn circle geometry using circular geoboards.
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