On March 2010, the Pi Day, 3.14 was celebrated by math nerds and Google, worldwide. Having been conspicuously missing from Google's ever-growing repertoire of special-event doodles for years, Google finally relented and unleashed its inner nerd, not that it tried to hide it too hard in the past. And, perhaps to make up for all the years it skipped, Google went all out this time and showed off six common uses of the famous number. The Pi Day Google logo starts off with the formula everyone knows (?) for the area of a circle A = πr2, but goes on with some more advanced stuff. The two 'os' in Google are used to represent the sin(x) function over a 2π period.

在2010年的3月14日，不僅僅是那些數學的狂熱愛好者，就連Google也來為圓周率π來做慶祝。

圓周率日這天的Google涂鴉由一個大家都認識的公式開始：圓的面積=πr²。之后還有幾個比較復雜的公式，一起組成了Google的字樣。

來源:可可英語 http://www.ccdyzl.cn/read/201011/117200.shtml