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The use of digital technologies in educational contexts has favored the possibilities of visualization and experimentation in Mathematical Education, which has allowed a reorganization of mathematical knowledge in the development of the school activity carried out. In this sense, this work analyzes an experience in which a student from Venezuela's middle school reorganizes his ideas about what a square is, through Simulator Development with GeoGebra (SDG). For this, the research was contextualized, and then continued defining what SDG is and how it is understood according to the perspective of what the reorganization mediated by digital technologies is and the ideas of Human-beings-with-media. The methodology of this work is qualitative, of a descriptive-interpretative nature, being presented the context, participants, the source of the data and their analysis. Among the results, in the speech of the participants, it is observed the reorganization of what a square is, starting from the visualization and experimentation of the characteristics of this figure in GeoGebra. From the analyzed information, it is considered that teachers can have initiatives to carry out activities mediated by digital technologies that help in the reorganization of geometric concepts.

Reorganización del Conocimiento Matemático en la Elaboración de Simuladores con GeoGebra: Análisis de una actividad que envuelve la noción de Cuadrado