在做数学题时,只要涉及圆的计算,题目后面总会有一个括号注明:圆周率π=3．14。其实,π并不等于3．14。在东汉时,我国著名的数学家张衡,就精确地将圆周率计算到了小数点后第七位。几十年前美国科学家又利用计算机将π推算到了小数点后几十万位。可是,一般人们记得的,常用的却只是π=3．14。3．14之后的无数个数字全都被简化成了一长串省略号。 When doing math problems, as long as it involves a round of calculations, there will always be a parenthesis after the title: Pi ratio = 3.14. In fact, π does not equal 3.14. In the Eastern Han Dynasty, Zhang Heng, a famous mathematician in China, accurately calculated the pi to the seventh decimal place. Decades ago, scientists in the United States used computers to calculate π to hundreds of thousands of decimal places. However, what people usually remember is only π = 3.14. The countless digits after 3.14 are all reduced to a long list of ellipses.