輸入需要查詢的詞語：
詞條：祖率
zǔlǜ
[the approximate ratio of the circumference of a circle to its diameter as calculated by Zu Chong Zhi][數]︰南北朝時祖沖之算出圓周率的近似值在3.1415926和3.1415927之間,並指出圓周率的約率為22/7,密率為355/113。為了紀念祖沖之,把他算出的近似值叫做祖率