It's a very deep number. It crops up all over the place in higher maths. Even things that obviously have nothing to do with circles. Some examples:
<img src=http://mathurl.com/yaub323.png>
<img src=http://mathurl.com/yhp2l9h.png>
<img src=http://mathurl.com/y86yvhs.png><img...
How about this for awesome: There are several different types of infinity, of different sizes. And if you dont believe me I can prove it to you, in about 5 minuets using no complicated ideas or words of more the 3 syllables. Go to...
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