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Apresentamos um estudo sobre as decisoes didaticas de uma professora e a identificacao de fatores que as originam em relacao a seu trabalho documental para o ensino de trigonometria. Baseia-se o estudo na abordagem documental do didatico ; no modelo dos niveis de atividade do professor, na teoria antropologica do didatico e no modelo de fatores decisorios. Seguindo os pressupostos da metodologia de investigacao reflexiva, durante duas semanas, acompanhou-se o trabalho documental de uma professora sobre a elaboracao de uma sequencia e de uma aula de revisao sobre o ensino de razoes trigonometricas. Os resultados apontam suas tomadas de decisoes, desencadeadas por fatores epistemicos (tipos de tarefas e de tecnicas) ou relacionados a historia didatica (relacao entre professora e alunos) sobre o ensino do tema. This work aims to present an analysis of a teacher’s didactic decisions and the identification of factors that raised them in relation to her documentary work for the teaching of trigonometric ratios. The study is based on the documentary approach of didactics ; the model of the teaching activity; the anthropological theory of teaching; and the model of factors that influence decision-making. Based on the assumptions of the reflective research methodology, the documentary work of a teacher on the elaboration of a sequence and a revision lesson on the teaching of trigonometry was observed during two weeks. The outcomes point out that her decision-making resulted from epistemic factors (types of tasks and techniques), or was related to the didactic history (the relationship between teacher and students) on the teaching of the topic.

educação matemática pesquisa

Decisões didáticas e fatores que as influenciam no ensino de razões trigonométricas &lt;br&gt; Didactic decisions and factors that influence them in the teaching of trigonometric reasons