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...Working group d geometry and learning of mathematical reasoning joris mithalal phd student laboratoire informatique de grenoble lig didactique apprentissage des mathematiques diam universite joseph fourier france teaching proof is a great issue mathematics education traditional context for it nevertheless especially in plane the students often focus on drawings as they can see results don t need to use neither axiomatic nor formal this thesis work we tried analyse how space situations could incite using duval s distinctions between iconic non visualization will discuss here potentialities based dynamic software show few experimental resolving problems usual way mainly used properties which are physical objects instead figures theoretical ones case may solve by empirical solutions their own action drawing one read property that why regards very confusing many them since able easily seems be useless appear didactical contract effect parzysz contrary much harder certain visual noticing ne...