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...Errors in the teaching learning of basic concepts geometry lorenzo j blanco activities teacher education work that we are presenting was carried out with prospective primary teachers ppts studying faculty university extremadura spain content formed part obligatory course didactics designed to be taken third year official plan studies objective is student should acquire pedagogical knowledge mellado y ruiz related our intention which develop might generate simultaneously mathematical and also take it curricular proposals imply an epistemological change respect school level classroom activity may result generation this preceding investigations have indicated us concerning particular about geometrical they deeply rooted conceptions mathematics deriving from their own experience as secondary pupils present contradictions new culture aim therefore not only broaden or correct relative specific but put forward encourage reflection on how generated developed taking into account process working...