In this work, we show results of the design and implementation of a Study and Research Activity for the study of inscribed angles and cyclic quadrilateral in high school. The didactic device was designed considering the fundaments of the Anthropological Theory of Didactics. The activity involved paper and pencil tasks and the use of Geogebra® software. The combination of tasks allowed the integration of concepts in the study of cyclic quadrilaterals proposed study in isolation in curriculum design.
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