3.1415926535897932384626433832795028841971693993…. you get the point, right? đťť… or pi is simply described as one half the perimeter of the circle. In algebra, pi is commonly rounded to 3.14. As a result, every year on March 14, pi day is celebrated in math classes and restaurants across the world. NBCâ€™s article, *Pi Day: 7 interesting facts about the most famous number in mathematics,* was a pretty interesting read, check these cool facts about pi:

**Pi is all-encompassing**

According to **NBC News**, â€śIn its endless stream of digits, pi is believed to contain the numbers 0 through 9 in every conceivable combination, forming every possible string of digits. Your phone number, social security number, ATM code and every other string of numbers you can imagine are in there somewhere. If you convert letters into numbers (for example, â€śc-a-bâ€ť could be â€ś3-1-2â€ť), then every essay youâ€™ve ever written and every book youâ€™ve ever read is in there â€” along with the complete works of Shakespeare.â€ť

**Weâ€™ve used computers to calculate pi to more than 22 trillion digits**

â€śIn 2016, a Swiss scientist, Peter Trueb, used a computer with 24 hard drives and a program called y-cruncher to calculate pi to more than 22 trillion digits. If you read one digit every second, it would take you just under 700,000 years to recite all those digits,â€ť NBC News reports.

**Even rocket scientists only need a bit more than a dozen decimal places**

â€śThough we know trillions of digits of pi, we donâ€™t really need them. Even the engineers at NASA round pi off to 15 decimal places when calculating interplanetary trajectories. In fact, if you were trying to calculate the size of the observable universe, using 39 digits of pi would give you an answer off by no more than the width of a hydrogen atom,â€ť reported NBC News.

Teachers such as **Ms. Sheila Oâ€™Bryen**, **Mr. Tom Lamble**, and **Ms. Meredith Anderson** even had pi day celebrations for their math and science classes. All three teachers hosted parties in which students consumed copious amounts of pie and various round objects. All three classes had fun, pi day activities like solving puzzles, doing labs to calculate digits of pi, or just playing charades.

â€śMath gives us hope that every problem has a solution,â€ť Ms. Meredith Anderson says.