# Happy Pi Day

3/14 is considered to be Pi Day by many geeks, as π is approximately 3.14. I wish I could say that I had celebrated by eating pie, but I didn’t.

π is surely the most important irrational number, which has been known since antiquity.

π shows up in so many different formulas.
My own favorite is Euler’s Identity,
*e*^{iπ} + 1 = 0.
(This marks the first use of the reStructuredText math role in my blog.)

I am also find of the approximate fraction 355 ⁄ 113.

The Wikipedia article on π has much more on π.

**Update**:
Wonkblog: 10 stunning images show the beauty hidden in pi

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