在求准确圆周率值的征途中，首先迈出关键一步的是三国时期魏国杰出的数学家刘徽。他创立割圆术，用圆内接正多边形无限逼近圆而求取圆周率值。
On the journey of finding a precise pi ， Liu Hui ， a prominent mathematician of the Kingdom of Wei during the Three Kingdoms period ， took the first crucial step by approximated pi .
刘徽