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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).

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  • 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). (en)
  • O algoritmo de Zhao Youqin para π foi um algoritmo criado pelo astrônomo e matemático chinês da Dinastia Yuan Zhao Youqin (赵友钦, ? – 1330) para calcular o valor de π em seu livro Ge Xiang Xin Shu (革象新书). (pt)
  • 赵友钦割圆术是元代数学家赵友钦在所著的《革象新书》卷五《乾象周髀》篇研究的割圆术。与刘徽从内接正六角形开始不同,赵氏割圆术从分割内接正方形开始。 如图,圆的半径为r; 内接正方形的边长为 ,由圆心到正方形一边倒垂直距离为 d d 的延长线与圆周相交点将圆周等分为正八边形。 令正八边形的边长为 设 为分割圆成正16边形之边长,赵友钦正确地推断与的迭代关系: 推而广之: 令 r=1; …… (zh)
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  • 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). (en)
  • O algoritmo de Zhao Youqin para π foi um algoritmo criado pelo astrônomo e matemático chinês da Dinastia Yuan Zhao Youqin (赵友钦, ? – 1330) para calcular o valor de π em seu livro Ge Xiang Xin Shu (革象新书). (pt)
  • 赵友钦割圆术是元代数学家赵友钦在所著的《革象新书》卷五《乾象周髀》篇研究的割圆术。与刘徽从内接正六角形开始不同,赵氏割圆术从分割内接正方形开始。 如图,圆的半径为r; 内接正方形的边长为 ,由圆心到正方形一边倒垂直距离为 d d 的延长线与圆周相交点将圆周等分为正八边形。 令正八边形的边长为 设 为分割圆成正16边形之边长,赵友钦正确地推断与的迭代关系: 推而广之: 令 r=1; …… (zh)
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  • Algoritmo de Zhao Youqin para π (pt)
  • Zhao Youqin's π algorithm (en)
  • 割圆术 (赵友钦) (zh)
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