اﻟﺧﻼﺻــــﺔ ﻧﺗﻌرف ﻋﻠﻰ ﻣﺳﺗﻘﯾم ﻣوازي ﻷﺣد ﻣﺳﺗوﯾﺎت اﻹﺳﻘﺎط اذا ﻛﺎن ﻟﮫ ﻣﺳﻘطﯾن ﻣوازﯾﯾن ﻟﻣﺣورﯾن ﻣﺧﺗﻠﻔﯾن. conclusion On reconnait une droite parallèle à un plan de Projection si deux de ces projections soient parallèles à deus axe différents
اﻟﺧﻼﺻﺔ اﻟﻧﮭﺎﺋﯾﺔ Conclusion finale ﻓﻲ اﻟﻧﮭﺎﯾﺔ ﯾﻛون أﺣد ﻣﺳﺎﻗط اﻟﻣﺳﺗﻘﯾم ﺧط ﻣوازي ﻟﻣﺣور ﻗﺎﺳم ﻣﺷﺗرك ﺑﯾن اﻟوﺿﻌـﯾﺎت اﻟﺷﮭــﯾرة اﻟﺳﺗﺔ اﻟﺗﻲ ﺑواﺳطـﺗﮭﺎ ﯾﺗم اﻟﻌـﺛور ﻣﺑﺎﺷرة ﻋﻠﻰ اﻟﺑﻌد اﻟﺣﻘﯾـﻘﻲ ﻟﻠﻣﺳﺗﻘـﯾم و ھو ﺷرط ﻛﺎﻓﻲ اذا ﺗم ﺗﺣﻘـﯾـﻘﮫ ﻟﻠﻣﺳﺗﻘـﯾم اﻟﻛﯾـﻔﻲ اﺳﺗطﻌﻧﺎ اﻟﻌﺛور ﻋﻠﻰ ﺑﻌده اﻟﺣﻘﯾﻘﻲ. Finalement une projection parallèle à un axe est un facteur commun entre les six cas de droites remarquables, et condition suffisante si on peut la réaliser pour la droite quelconque on pourra trouver sa vraie grandeur.
ب-اﻟﺑﺣث ﻋن اﻟﺑﻌد اﻟﺣﻘﯾﻘﻲ ﻟﻠﻣﺳﺗﻘﯾم اﻟﻛﯾﻔﻲ : Recherche de la vraie grandeur d’une droite quelconque
ب 1طرﯾﻘﺔ اﻟدوران Méthode de rotation AB= ab
اذا ﻛﺎﻧت ﻋﻣﻠﯾﺔ اﻟدوران ﺗﺣدث ﻋﻠﻰ اﻟﻣﺳﻘط اﻟﺟﺎﻧﺑﻲ ﺑﺗﻐﯾﯾر ارﺗﻔﺎع و اﺑﺗﻌﺎد اﺣد ﻧﻘطـﺗﻲ اﻟﻣﺳﺗﻘـﯾم ﺣﺗﻰ ﯾﺻﺑﺢ اﻟﻣﺳـﻘط ﻣوازي ﻷﺣد اﻟﻣﺣﺎور ،ﻧﺣﺗﻔظ ﺑﻔﺎﺻﻠﺔ اﻟﻧﻘطﺔ اﻟﻣدارة ﻟﺗﻌﯾـﯾن وﺿﻌﮭﺎ اﻟﺟدﯾد ﻋﻠﻰ اﻟﻣﺳﻘط اﻟﻣواﻟﻲ اﻟذي ﯾﺷﻛل اﻟﺑﻌد اﻟﺣﻘﯾﻘﻲ. Si la rotation se fait sur le plan de profil en modifiant Y et Z de l’un des points de la droite jusqu’à ce que celle ci soit parallèle à l’un des axes, on garde X du point pivoté pour déterminer sa nouvelle position qi forme la vraie grandeur.
اذا ﻛﺎﻧت ﻋﻣﻠﯾﺔ اﻟدوران ﺗﺣدث ﻋﻠﻰ اﻟﻣﺳﻘط اﻷﻣﺎﻣﻲ ﺑﺗﻐﯾﯾر ارﺗﻔﺎع و ﻓﺎﺻﻠﺔ اﺣد ﻧﻘطـﺗﻲ اﻟﻣﺳﺗﻘـﯾم ﺣﺗﻰ ﯾﺻﺑﺢ اﻟﻣﺳـﻘط ﻣوازي ﻷﺣد اﻟﻣﺣﺎور ،ﻧﺣﺗﻔظ ﺑﺎﺑﺗﻌﺎد اﻟﻧﻘطﺔ اﻟﻣدارة ﻟﺗﻌﯾـﯾن وﺿﻌﮭﺎ اﻟﺟدﯾد ﻋﻠﻰ اﻟﻣﺳﻘط اﻟﻣواﻟﻲ اﻟذي ﯾﺷﻛل اﻟﺑﻌد اﻟﺣﻘﯾﻘﻲ. Si la rotation se fait sur le plan frontal en modifiant X et Z de l’un des points de la droite jusqu’à ce que celle ci soit parallèle à l’un des axes, on garde Y du point pivoté pour déterminer sa nouvelle position qi forme la vraie grandeur.
ﻧﺧﺗﺎر اﺣد ﻣﺳﺎﻗط اﻟﻣﺳﺗﻘﯾم،ﻟﻠﺑﺣث ﻋن اﻟﺑﻌد اﻟﺣﻘﯾﻘﻲ ﻟﻠﻣﺳﺗﻘﯾم ﺑطرﯾﻘﺔ اﻟدوران ﺛم ﻧﺛﺑت اﺣد ﻧﻘطﺗﯾﮫ و ﻧدﯾر اﻻﺧرى ﺣﺗﻰ ﯾﺻﺑﺢ اﻟﻣﺳﺗﻘﯾم ﻣوازي ﻻﺣد ﺛم ﻧﺑﺣث ﻋن اﻟﻧﻘطﺔ اﻟﻣدارة ﻋﻠﻰ اﻟﻣﺳﻘط اﻟﻣواﻟﻲ ﺑﺎﺳﺗﻌﻣﺎل اﻻﺑﻌﺎد.اﻟﻣﺣﺎور اﻟﺟدﯾدة ﻋﻠﻰ ﻣﺳﺗوي اﻟﺗدوﯾر و اﻻﺣﺗﻔﺎظ ﺑﺎﻟﺑﻌد اﻟﻧﺎﻗص ﻋﻠﯾﮫ ﻟﺗﻌﯾﯾن اﻟوﺿﻊ .اﻟﺟدﯾد ﻟﻠﻧﻘطﺔ ﺣﯾث ﺗﻌطﯾﻧﺎ ﻣﻊ اﻟﻧﻘطﺔ اﻟﺛﺎﺑﺗﺔ اﻟﺑﻌد اﻟﺣﻘﯾﻘﻲ Pour chercher la vraie grandeur d’une droite par la méthode de rotation, on choisi une des projections de la droite ,on fixe l’un de ces points et on pivote le deuxième jusqu’à ce que la droite soit parallèle à un axe. Pui on cherche le point pivoté sur le plan suivant en utilisant ses nouvelles coordonnées sur le plan de la rotation en préservant celui qui manque sur celui-ci, pour déterminer la nouvelle position du point qui va former avec le point fixe la vraie grandeur .
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