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A proof of the Pythagorean theorem on a wallpaper, of which all marked points are symmetry centers if the colors are disregarded. Even by considering the colors, point C, or S, or T is center of a central inversion of the wallpaper.
Une preuve du théorème de Pythagore sur un papier peint, dont tous les points marqués sont des centres de symétrie en négligeant les couleurs. Même en les prenant en compte, le point C, ou S, ou T est un centre de symétrie du papier peint.