I saw recently that you would only need 39 decimals of pi to calculate the diameter of the observable universe to the margin of a single hydrogen atom. So then how in the world do people make the calculations to find more digits of pi? How did we get to so many?
In: Mathematics
As others have mentioned there are several infinite series for the value of pi.
With computers, it is relatively easy (from a programming viewpoint) to calculate pi to any degree required. All it requires is computing time and power. We have very powerful computers so getting pi to millions of digits isn’t very difficult even for a beginner at programming using a relatively modern computer.
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