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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，不仅仅是那些数学的狂热爱好者，就连Google也来为圆周率π来做庆祝。
圆周率日这天的Google涂鸦由一个大家都认识的公式开始：圆的面积=πr²。之后还有几个比较复杂的公式，一起组成了Google的字样。
