Happy 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.

Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.



1. Some also celebrate July 22 as Pi Day, because 22/7 is a common approximation to pi.

2. Pi is an irrational number: its decimal value goes on for ever, never stopping or repeating.

3. The value of pi has now been calculated to more than two trillion decimal places.

4. The world record for memorizing the value of pi was set by Chao Lu of China in 2005. He correctly recited from memory its first 67,890 digits.

5. It took him 24 hours and four seconds at a rate of 47 digits a minute without food or toilet breaks.

6. He had planned to recite 93,000 digits but made a mistake at the 67,891st.

7. A bill before the State Legislature of Indiana in 1897 tried to set the value of pi at 3.2. It was narrowly defeated

8. If you write “3.14” on a piece of paper and hold it up to a mirror, it looks like the word “PIE”.

9. Albert Einstein was born on Pi Day: March 14, 1879.

10. The Greek letter pi was introduced for the ratio of a circle’s perimeter to its diameter by the Welsh mathematician William Jones in 1706.




510 MCK

(OMG, Winnie Cooper)!


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