The Pi (Greek letter “π”) is number commonly known and referred as 3,14. The symbol of the pi number is the first letter of the Greek word meaning environment and the 16th letter of the Greek Alphabet. The pi number is “the ratio of the circumference to the diameter of a circle”.

The earliest use of the symbol for the pi number sates back to the beginning of the 18th century by mathematician William Jones in his work of “a New Introduction to the Mathematics”. It is an irrational number and millions of the it have been calculated. The first 100 digits of the pi number is as follows:

3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 7067

The pi number has been known thousands of years dated back to Babylonians. Archimedes, one of the greatest mathematicians in the history of humankind, was the first person to calculate as 31/7 and that’s why, the pi number is sometimes called as Archimedes’ constant. Today,  the pi number is vastly applied in mathematics, geometry and trigonometry,  statistics, physics and computer science as well.

Pi day is Pi Day is celebrated on March 14. Simply because that date seems like 3/14, the pi number. The birthday of Einstein is also the same date, which is a pleasant coincidence.   The day first promoted by the eminent physicist Larry Shaw in 1998 but later in 2009 it was officially accepted as a national day in the USA.

The pi number is a part of popular culture. In fact, calculating and reciting the decimals of the pi number have been a fashion among math fans. Especially, memorising the digits of the pi number reach unprecedented volumes. The record for memorizing digits is certified by Guinness World Records, is 70,000 digits, recited in India by Rajveer Meena in around 9 hours in 2015. While a Japanese engineer claimed to have recited 100,000 decimal places, it was not accepted by the Records Book.

References:
http://www.livescience.com

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