Jisho

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Noun
1. votive tablet depicting a mathematical puzzle that was placed as an offering at a shrine or temple (Edo period)Historical term
Wikipedia definition
2. SangakuSangaku or San Gaku 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.
Read “Sangaku” on English Wikipedia
Read “算額” on Japanese Wikipedia
Read “Sangaku” on DBpedia

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