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Ahead of Pi Day (March 14), Matt Parker tries to accurately calculate pi using pies. [SLYT] An extended version of the video will be uploaded on Pi Day, but here's your chance to go out and buy pies before that.
(Video runs 3 minutes, 14 seconds.)

This is what pi sounds like. At least, that's one person's interpretation. There are certainly plenty of others, including touchtone pi, hammered dulcimer pi, violin pi, smooth techno pi, crazy awesome pi, vaguely unsettling pi (sounds best with headphones), and lots of piano pi. Pi has even done a duet with its buddy *e*. Nothing here that tickles your fancy? Think you could do better? Why not make your own pi song? Hell, make two! If you're having trouble remembering all those pesky digits, don't worry: there's a song for that, too.

(pi as music previously on metafilter)

(pi as music previously on metafilter)

How do you calculate Pi? Build a supercomputer. *The Mountains of Pi*, a New Yorker profile of the mathematician (sic) the Chudnovsky brothers. Warning: the article is from 1992, and internet is missing its definite article. (Previously)

"This day may be celebrated in a variety of ways. Pause and give thought to the role that the number pi has played in your life. Imagine a world without pi. Attempt to memorise pi to as many decimal places as you can. If you're feeling creative, devise alternative values for pi. Go to a party (I will). Or just celebrate in the time-honoured fashion of ignoring Pi Approximation Day altogether."

Happy Pi Approximation Day. [more inside]

Happy Pi Approximation Day. [more inside]

Ever wondered if and where a specific set of numbers could be found in pi? Maybe you'd like to know where your birthday is? Or maybe just something funny. [prev. here, here] [more inside]

Nowhere-neat tilings are actually pretty neat. We all know you can't "square the circle", but do you know the story of squaring the square? (And by the way, even if you can't construct π with a ruler and compass, you can come awfully close without too much work.)

Pi to 1,000 places on piano is just one of the many catchy tunes on math sonifications. And check out more interesting things on on artist Tom Dukich's site.

Very few people will ever need to learn the value of pi beyond a handful of digits, but some people are more obsessed than others. They call themselves Piphilologists, and all the pi-memorization writings you could ever possibly want have been compiled into one massive Piphilogical text file. And today, Piphilologists the world over must surely bow in tribute to Akira Haraguchi, who has just recited pi from memory to 83,431 places.

Whether its crocheted hyperbolic models or Lorenz manifolds, a lace pi shawl or knit Fibonacci socks, some math geeks find expression in the fiber arts.

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