A Pi Pie at Delft University of Technology

We are happy to join in the international celebration of **Pi Day** on March 14th (that’s 3/14, hence …** Π**).

Of course, you could also observe **Pi Approximation Day** on July 22nd, since the fraction ^{22}⁄_{7} is a common approximation of **pi.**

Pi, Greek letter (**Π**), is the symbol for the ratio of the circumference of a circle to its diameter. Pi Day is celebrated by math enthusiasts around the world on March 14th.

With the use of computers, pi has been calculated to over 1 trillion digits past the decimal. Pi is an **irrational** (Lambert 1761) and **transcendental **(Lindemann 1882) number, meaning it will continue infinitely without repeating. The symbol for pi was first used in 1706 by William Jones, but was popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737.

For some really interesting and unexpected information about** Π** , take a look at **this article** on the **Wolfram MathWorld** site. It seems that** Π** has applications everywhere, from calculating distances in a meandering river to a secret code in the Hitchcock movie *Torn Curtain.* Not to mention the second pizza theorem, Buffon’s needle problem, and the normalization of the normal distribution (I guess it just wasn’t normal enough).

So, however you choose to recognize **International Pi Day**, we’re with you!

**Send Happy Pi Day eCards**

**Like Pi Day** on Facebook

Check out some** Pi rap** (I am not making this up)

… and some **pretty neat Pi music and videos** on this **Pi Day site**

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