page_title: Zhao Youqin's π algorithm
hierarchical_section_title: Zhao Youqin's π algorithm
caption_attribution_description: 中文: 赵友钦割圆术书影
context_page_description: Zhao Youqin's π algorithm was an algorithm devised by Yuan dynasty Chinese astronomer and mathematician Zhao Youqin to calculate the value of π in his book Ge Xiang Xin Shu.
context_section_description: Zhao Youqin's π algorithm was an algorithm  devised by  Yuan dynasty Chinese astronomer and mathematician Zhao Youqin (赵友钦, ? – 1330) to calculate the value of π in his book Ge Xiang Xin Shu (革象新书).
caption: A page from Zhao Youqin's book Ge Xiang Xin Shu vol 5
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