Late Pi Day

Pie? Like the food?

OK, you've probably heard that before, as Pi Day is now more conspicuous in terms of holidays. Happy 6-days-too-late-for-Pi Day!

The approximate ratios for pi are:
3 digits: 22/7
4 digits: 245/78
5 digits: 333/106
6 and 7 digits: 355/113
continued...
38 digits: 2,646,693,125,139,304,345 / 842,468,587,426,513,207
Well, quintillions are pretty accurate, right?

At digit 763, there are 6 nines in a row. This is the Feynman point.

To find the circumference of a circle the size of the universe to within the radius of a single proton, you only need 39 digits. Although that seems like a lot, it really isn't.

Chao Lu from China memorized 67900 digits of pi. Nice use of time, Chao! Especially considering the last fact!
A ten year old actually memorized 410 digits of pi. Either he felt the urge to learn all of them or his parents are gigantic perfectionists.

Pi is equal to...
6 * sqrt(sum (1-inf) (1/n^2) )
4 * (sum (1-inf) ((-1)^n /(2n+1)))

Although pi is determined by a ratio, it cannot be expressed using a ratio. Therefore, the circumference and/or the diameter must be irrational in a circle.

In the first six million digits of pi, five is the most common and zero is the least common. In the first million, five is the most common and seven is the least common.

Pi is technically mentioned in the bible- see 1 Kings 7:23.

Pi has been referenced in a huge amount of books, TV shows, and movies.

Extremely Cool Sites:
The Pi-search page- This finds certain strings of digits from the first 200 million digits of pi. Extremely cool website.
More Links

Keep calm and guess again!