
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. ==History== The Sangaku were painted in color on wooden ...
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http://en.wikipedia.org/wiki/Sangaku

(from the article `arts, East Asian`) Juggling, acrobatics, ropedancing, buffoonery, and puppetrythe `hundred entertainments` of China and called sangaku, `variety arts,` in Japanbecame ...
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http://www.britannica.com/eb/a-z/s/25
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