汉英词典
Chinese-English Dictionary
MEANING OF 圆周率
圆周率 (圓周率)
(math.) the ratio of the circumference of a circle to its diameter (π)
圆周长与直径的比值。是一个常数,用π表示。中国数学家刘徽用割圆术求得π≈314,称为徽率。南北朝数学家祖冲之算出31415926<π<31415927,并以227作为约率,355113为密率。近代电子计算机出现后,π的近似值精确度大大提高。已经证明π是无理数,也是超越数。
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