[size=150][img]data:image/png;base64,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[/img] Symétrie centrale sur un quadrillage. Faites défiler les étapes.[br]Les points A et O peuvent être déplacés à tout moment.[br](NB : si l'exécution est saccadée, téléchargez le fichier et exécutez en local)[br][br][img]data:image/png;base64,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[/img] Point reflection on a grid. Follow the steps.[br]Points A and O can be moved at any time.[br](NB : if the execution is jerky, download the file and run it locally)[/size]