Aaron Goldstein (bredmold) wrote,
Aaron Goldstein

Pi Approximation Day

So, my friend Steve just found me on Facebook. That's cool, Steve's an interesting guy and it never occurred to me to look for him. Anyway, I quickly scanned his recent comments and he pointed out that some folks write July 22 as 22/7 ... which is a famous historical approximation of pi (handed down to us from Archimedes). So, today is Pi Approximation Day... which I find to be at least as interesting as Pi Day itself (March 14).

According to my windows calculator program: 22/7 = 3.1428571428571428571428571428571
According to my memory: pi = 3.1412565359

So, that's accurate in the first two digits, with an error factor of roughly 0.04%
Pretty cool

Archimedes' method for approximating pi
Formula that gives the n'th hexadecimal digit of pi without reference to any of the previous n-1 digits

OK, so the second one isn't an approximation... it's actually pi. Anyway, that's what I could come up with in 15 minutes at work. Thanks, Steve!
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I'm not much of a pi nerd, but I'm pretty sure the first 5 digits are 3.14159. Still not bad, since I kinda stop paying attention after 2.
Off the top of my head, 3.14159265. Now let me check...

http://en.wikipedia.org/wiki/Π says .1415926535897932384626433832795...
Ha! Livejournal broke the URL. The π is supposed to be part of the URL there.
Heh... apparently I fail... if I'd looked at what I typed out, I would've spotted the error myself.