Quite possibly the answer obtained by Alexander J Lee and Shigeru Kondo in October 2011. See link.
However, it is highly unlikely that you will be able to use it in any computer you can lay your hands on. Furthermore, it is claimed that the error in pi to 40 digits is smaller than the width of a hydrogen atom at the far end of the known universe. For most purposes that degree of accuracy is overkill!
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Think of pi as infinity. It never ends. You might mean "3.14" as an approximation of pi, though.
That depends on how precise you want the approximation.
22/7=3.14286 Which is a fair approximation to Pi, but 355/113 =3.14159 and is a much better approximation.
That is an approximation of the number pi.
That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.