Sangaku

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Notion

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Science and technology

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What Wikipedia says

Sangaku or san gaku (Japanese: 算額, lit. 'calculation tablet') are Japanese geometrical problems or theorems on wooden tablets which were placed as offerings at Shinto shrines or Buddhist temples during the Edo period by members of all social classes.

Excerpt from the Wikipedia article “Sangaku”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Momotarou2012, CC BY-SA 3.0, via Wikimedia Commons.