**Saturday is Pi Day! Pi Day is celebrated on March 14th (3/14) around the world.** Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. (Source: http://www.piday.org)

**Celebrate the event with a pizza pie, apple pie or simply use the circumference of your head. Below are rational activities and resources for an irrational number.**

**Pi Day Activities**

- Exploratorium: http://www.exploratorium.edu/pi/pi_activities/index.html
- PBS Learning Media: bit.ly/1EKuCKq

**Connecticut Science Center: Ultimate Pi Day**

http://www.ctsciencecenter.org/things-to-do/events-calendar#pi

Help us celebrate this endless number (3.14159… ) and Einstein’s birthday, with family friendly Pi-related activities. At 3:14 PM, join us in the lobby for a once-in-a-lifetime photo op as we commemorate the Pi Day of the century with a 100-person Pi chain. The more people that participate, the longer the Pi chain will be. Those who wish to participate should gather in the lobby at 3PM. After the photo op, we’ll all enjoy a free sample of apple pie, courtesy of Lyman Orchards (Pie available while supplies last).

**Scientific American: What is pi, and how did it originate?**

http://www.scientificamerican.com/article/what-is-pi-and-how-did-it/

Succinctly, pi–which is written as the Greek letter for p, or –is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14. But pi is an irrational number, meaning that its decimal form neither ends (like 1/4 = 0.25) nor becomes repetitive (like 1/6 = 0.166666…). (read more)