At one level a huge deal. Pi is known to an accuracy of the width of a hydrogen atom at the far end of the known universe.
At the same time, since pi is an irrational number, it has an infinitely long decimal representation with no recurrence. So even if we knew 1 quadrillion digits of pi (we don't yet) we would only know one quadriliion infinitieth (to coin a word) of pi - that is 0%.
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the founder of the longest pi is...
The digits of pi are known to more than a trillion (1012) digits, but it is impossible to state all of them in this forum.
Aryabhatta did not discover pi - it was known long before him. He found a more accurate value and a method for calculating pi to greater accuracy than was previously known.
Circumference of a circle = 2*pi*radius or pi*diameter
The number pi can be defined as: pi = circumference / diameter. Solving for diameter: diameter = circumference / pi. Pi is approximately 3.14.