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Reference.org
Zhao Youqin's π algorithm
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<p>Zhao Youqin's π algorithm is an algorithm devised by <a href="/facts/Yuan_dynasty/mQl0o0XN">Yuan dynasty</a> Chinese astronomer and mathematician Zhao Youqin (赵友钦, ? – 1330) to calculate the value of <a href="/facts/Pi/vC0UBj1q">π</a> in his book <i>Ge Xiang Xin Shu</i> (革象新书). </p>