The longest known value of pi is now into the hundreds of billions of digits.
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solving for pi... as far as we know now, it is infinate.
Multiply the known diameter by the value of PI - and you'll have your answer !
The name of the one who invented pi is hypotenuse. LOL! No-one "invented" the ratio known as pi, but establishing its original discoverer is another matter. As for "Hypotenuse" - "he" is the name for the longest side of a right-angled triangle. It was never anyone's name.
pi became 3.14 from a long division problem that is probably the longest number in the world.
No one has ever found the exact value of pi because it is an irrational number that can't be expressed as a fraction and its value has been calculated to more than two trillion digits yet still not found exactly.