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De petits sangaku, niveau collège
Normalement pas trop durs, enfin... il vaut mieux prendre un peu l'habitude des constructions et des raisonnements, très spécifiques.
Certains sont de moi, inspirés des sangaku classiques.
La plupart sont extraits de ce bouquin indispensable:
Sacred Mathematics
Japanese Temple Geometry
Fukagawa Hidetoshi & Tony Rothman
Princeton University Press, 2008