In this research we examine the convictions of teachers and students regarding the existing relations between perimeter and area of a flat figure. The research is inserted in a classical position, explored for more than 60 years, but that today includes new factors. Particularly, the change of the convictions is studied, the language utilized to express that change, the degree of incident that have the given examples, and, particularly, we discuss the idea that the supposed relations between perimeter and area constitute an example of the not criticism attitude of the student that tends to confirm increases or decreases among entities put in relation.
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