# Ten random facts about pi

1. It’s Pi-day today!
2. Maybe they were preparing festivities… anyway, lately the number one search term for people coming to Qulog is Pi Song.
3. As a result, the stats on that post have gone up from maybe four every day to over $10\pi$ yesterday!
4. There are $\pi \times 10^7$ seconds in a year (error is less than a percent).
5. You can ‘measure’ $\pi$ by repeatedly dropping a needle onto a ruled surface. It’s not a very practical way, but I like it anyway.
6. Somewhere in the digits of $\pi$ is my birthday. (But where? I always forget.)
7. A circle with diameter 1 has circumference $\pi$ and surace area $\pi / 4$.
8. During a lecture on quantum field theory, Gerard ’t Hooft once joked that he used the ‘small circle approximation’: $2\pi = 1$.
9. There are more pi-songs than just the one I wrote about last year.
10. Oh, I almost forget: $\pi = 3.14159$, followed by a lot of digits I don’t remember…
1. bart

Your birthday (and many other strings of numbers) can be found in pi’s digits via the Pi search page: http://www.angio.net/pi/piquery.html

“The string ******** [censored] occurs at position 7,411,604 counting from the first digit after the decimal point. The 3. is not counted.

The string and surrounding digits:
90873298712148346809 ******** 02253004005621775580 [censored again]”

Though censored, there is sufficient information available to retrieve your date of birth…

2. :-)
Thanks for the censoring!

3. Wilfred

But is is only Pi-day in the usa, right? ;-)
By the way, surace -> surface.
My favourite fact about Pi is that it’s a transcendental number.

4. Machiel

It made my A5 class laugh out loud when I told them about pi day. We, the chemists, also have a day called Mole Day. It’s either on June 2 (6/02) from 10.23 AM to 10.23 PM, or on October 23 (10/23), from 6:02 AM to 6:02 PM.

5. @ Wilfred: Thanks for pointing out the typo. Yes, it’s only Pi-day in the US, and then only for the nerds who like this sort of thing.

@ Machiel: Mole day… that’s a nice one, too. There must be a lot more possibilities…. $\hbar$ day? 1st of May (5th of Jan in the USA), 10:34 or something (maybe 9:26, because that’s 10:(-34)?).

6. Thanks for the article. This is way of the mark…but I was delighted to know that my sur-name has a day reserved for it. LOL :)

7. You’re lucky with a name like that!

8. cody

hi

9. it is actually 3.14159265… I memorized it… check your spelling… tootlez!

10. gretchen

wat do these facts mean? they make no sense wat soo ever! wat the heck? how am i supposed to find info about pi for my math project if a website cant give me any?! woww, thanks for helping me fail my project

11. riley

cody sounds like a cutie;)

12. PIE MAN

I LIKE PIE

13. Pingback: The Pi-day effect… « Qulog 2.0

14. Barbora

Hey, but year has pi*10^6 seconds!

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