sangaku
Sign in to savethumb|A sangaku dedicated to Konnoh Hachimangu (Shibuya, Tokyo) in 1859.
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thumb|A sangaku dedicated to Konnoh Hachimangu (Shibuya, Tokyo) in 1859.
Sangaku or san gaku () 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.
Excerpted from Wikipedia’s “sangaku” article, available under the CC BY-SA 4.0 licence.