As dificuldades e possibilidades de professores de matemática ao utilizarem o software Geogebra em atividades que envolvem o teorema de Tales

Abstract

The aim of this research was to verify which are the difficulties and possibilities of Mathematics teachers when they use the Geogebra software on activities related to Thales Theorem. Alternatively, this work intended too to investigate what would be the role of technologies on an eventual pedagogical work of teachers related to Thales´ Theorem. Four teachers of public schools of São Paulo State, Fundamental Level, took part of this investigation. The teachers participated in a workshop related to teaching math subject in focus in this work, and which proposed the development of teaching strategies using the software GeoGebra. In the analysis of the proposed activities for teachers, resorted to the study of seizures proposed by Duval as well as to the work of "pedagogical transposition" proposed by Chevallard. Other elements of this analysis considered the research related to the "computer transposition" of Balacheff and some works about the use of technology in Education in general, and in Mathematics Education in particular: the researches of Kenski, Frota & Borges and Oliveira. From the descriptions of the teachers, different profiles of use of technologies and educational performance, in relation to teaching strategies, were identified, highlighting the connection between the degree of reference mathematical knowledge and the proposed approaches with mediation by computational interface. Moreover, in the context of software use, it was possible to detect connections between the mastery of the topic itself, in a pedagogical and scientific ways, and the use of exposition in classroom, as well as the advance (or not) in the figurative seizure levels of teachers