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...Issn x online european journal of science and mathematics education open access https www scimath net vol no five years comparison between euclidian plane geometry spherical in primary schools an experimental study alessandro gambini sapienza universita di roma italy corresponding author uniroma it received jun accepted sep citation a doi org abstract we present the result eight year didactic experiment two school classes involving comparative activities euclidean that took place over following three on from end final questionnaires were administered codified order to evaluate project s effect pupils performance attitude especially with regard keywords lenart spheres introduction this research is part international framework focused value effectiveness or rather within teaching practices awareness regarded as difficult subject requires among other things transformation teacher way possibly use tools increase students interest active participation classroom one major problems learning c...