π – the World’s Most Mysterious Number

π – the World’s Most Mysterious Number

### π – the World’s Most Mysterious Number

Pi will be again on exhibit in the Orbach Science Library from March-June of 2013. This exhibit explores Pi, the world's most mysterious number. The value of Pi is approximately 3.14. But what is PI? What is the real value of PI? How can the value be found today using the most modern technology? How might Pi be used?

This year's Pi exhibit also features Pi in Action, displaying the actual surface area of a globe, the volume of the globe, and the circumference of a plate as fun pieces.

### Interesting facts about Pi:

- In 1706 William Jones (1675 – 1749) published his book Synopsis palmariorum matheseos, in which he used Pi to represent the ratio of the circumference of a circle to its diameter. This is believed to have been the first time that Pi was used as it is today.
- It was the legendary Swiss mathematician Leonhard Euler, often considered the most prolific writer in the history of mathematics, who is largely responsible for today's common use of Pi.
- Now we are in the trillions of decimal places.
- The record for memorizing digits of π, certified by
**Guinness World Records**, is 67,890 digits, recited in China by**Lu Chao**in 24 hours and 4 minutes on 20 November 2005. - The formula of volume of a sphere,
**V=4/3πr**was first derived by Archimedes, who showed that the volume of a sphere is 2/3 that of a circumscribed cylinder (This assertion follows from Cavalieri's principle).^{3} - The formula of surface area of a sphere,
**A=4πr²**was also first derived by Archimedes. - Pi lovers celebrate March 14 as PI-Day. What a coincidence that Albert Einstein was born on March 14, 1879.
- Check
**MathSciNet**or**Academic Search Complete**for articles about Pi.

This exhibit was curated by Ying Shen and Lizbeth Langston with assistance from Mary Miller, Jessica Reyes and Margarita Yonezawa.

Posted on 3/8/13 by D. Morita