Word: 圆周率 (yuánzhōulǜ) Traditional: 圓周率 圆周率 dictionary entry yuánzhōulǜ the ratio of the circumference of a circle to its diameter (π) Full dictionary entry for 圆周率 Example sentences using 圆周率 2 sentences, showing page 1 of 1. 古人很早就算过圆周率。 Gǔrén hěn zǎo jiùsuànguo yuánzhōulǜ. People in ancient times calculated pi very early on. 祖冲之把圆周率算得非常准确。 Zǔchōngzhī bǎ yuánzhōulǜ suàn dé fēicháng zhǔnquè. Zu Chongzhi calculated pi with great accuracy.