Well pi is a fascinating irrational number that represents the ratio of the cirumferencce of a circle to its diameter. It is approx. 3.14, and throughout history there have been many different approxiamations for it...
The first approximation of pi was from the Egyptians and it was (4/3)4
Next came Archimedes approximation that pi lay between 223/71 and 22/7.
There have been a number of different important approximations throughout history, so many that I'll only mention a few here!! In 1841 pi was calculated for the first time past 6 decimal places correclty, by an Englishmen William Rutherford.
Well I hope that helps you in your quest for pi.
Pi is a mathematical constant (the number doesn’t change). It is an
irrational real number, meaning that the digits do not create any
repeating pattern and it goes on forever. The value of pi is
approximately equal to 3.14159. To find the value of pi, you
calculate the ratio of a circle's circumference (distance around the
circle) to its diameter.
Happy Pi Day on March 14! (It's the 3rd month and 14th day... 3.14)