sangaku.info
Sangaku (Japanese votive tablets featuring mathematical puzzles)Sangaku (Japanese votive tablets featuring mathematical puzzles). Japanese mathematical votive tablet. Sangaku (算額) are votive tablets offered in shinto shrines. And sometimes in buddhist temples. In Japan. The earliest sangaku found date back to the beginning of the 17th century (a few years before the beginning of the japanese Edo period). Circles in a rectangle. An old sangaku in Kyoto. Two small sangaku recently dedicated to the yasui shrine in Kyoto. 1893 (Meiji 26 ) 1920 (Taisho 9). And the other i...
http://www.sangaku.info/