Da resolução de quebra-cabeças em sala de aula à aplicabilidade no cotidiano de uma marmoraria: o que os estudantes do 9º ano do ensino fundamental falam e escrevem sobre o conceito de área

Abstract

The main goal of this investigation is to analyze students‟ speeches and writings of students in the 9th year (Ensino Fundamental) about the concept of area , from guiding educational activities (Moura, 1996), involving the contents of notable areas of polygons:rectangles, triangles, , parallelogram, trapezoid triangle and losanges, including, the composition and the decomposition of plane figures. The activities constitute a puzzle. They were elaborated and developed by the researcher in the classroom and in the context of a marble yard.The investigation is qualitative and it can be characterized as a case study. It was conducted by the researcher the whole time, since he is the class teacher. It means, the teacher not only observed the class but also took notes of the movement that happened in the class. The question guiding the study is: what do students from the 9th year (Ensino Fundamenta) say and write about the area concept while they really live those guiding educational activities, inside the class and also in a marble yard context? The analysis of speech and writing were made by observing the categories related to the contents. As a result, the researcher tried to gather information, identify and comprehend, from the speeches and writings, what the students learned by showing it, as well as their difficulties or still, the relations that they make between what happens inside class and every day, giving emphasis on the use of formulas for calculating the areas and the application of these ones in the marble yard. It was also produced: guiding educational activities about the polygons area concepts.It is noteworthy, that this investigation summarizes theoretical and methodological the movements that happened inside the class and also in the marble yard.