Sangaku
Wooden tablets inscribed with geometrical theorems in Edo Japan / From Wikipedia, the free encyclopedia
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For the ancient Japanese performing art of sangaku (散楽), see Sarugaku.
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.