Sangaku

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A Sangaku dedicated at Enmanji Temple in Nara

Sangaku or San Gaku (算額; lit. translation: calculation tablet) are Japanese geometrical problems or theorems, in Euclidean geometry on wooden tablets which were placed as offerings at Shinto shrines or Buddhist temples during the Edo period (1603–1867) by members of all social classes.

• See also: Wikipedia, Commons

• Related: Recreational mathematics, Seki Takakazu, Equal Incircles Theorem

An interesting Sangaku problem An interesting Sangaku problem www.archimedes-lab.org/monthly_puzzles_66.html - Web

Pythagoras and Vecten Break Japan's Isolation Pythagoras and Vecten Break Japan's Isolation www.cut-the-knot.org/.../PythagorasWithVectenInJapan.shtml - Web

Sangaku: Reflections on the Phenomenon Sangaku: Reflections on the Phenomenon www.cut-the-knot.org/pythagoras/Sangaku.shtml - Web

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