Pi (𝜋) is simply defined as the ratio of circumference of a circle to its diameter.

That is: 𝜋 = ^{circumference}/_{diameter }= 3.1415926535… It is one of the constants we have in Mathematics.

For the convenience of students, pi(𝜋) is taken to be 22/7. This is not exactly correct. It should be noted that pi(𝜋) is an irrational number. It cannot be expressed exactly as a fraction.

Pi (𝜋) = 3.14159265358979… with the digits going on and on with no specific pattern. The digits keep going on and on without ending. It is a crazy mathematical constant!

Pi (𝜋) with the first 100 decimal places is as follows:

𝜋 = 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679…

On March 21 2015 , a 21-year-old Indian student, Rajveer Meena set a Guinness World Record on Pi (𝜋). He memorized 70,000 post-decimal digits of Pi. He made the record by reciting the 𝜋 digits up to 70,000 digits. He did that in 9 hours 27 minutes. Rajveer wore a blindfold throughout the entire recall.

**Pi (𝜋) Day**

Pi(𝜋) Day is celebrated on March 14th around the world. Why March 14th? March 14 could be written as 3/14. The first three digits of Pi (𝜋) is 3.14.

**Pi (𝜋) Approximation Day**

Pi (𝜋) Approximation Day is also celebrated on July 22 around the world. Why July 22? July 22 could be written as 22/7 (day/month date format). 22/7 is a common approximation of 𝜋 especially for the convenience of students.

(Photo Credits: www.livescience.com, keywordsuggest.org, etc.usf.edu)

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