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It was not invented it was discovered.
Pi is the value of a circle's circumference divided by its diameter and its true value has never been discovered because it is an irrational number
It's been proven that pi is an irrational number. In other words, it can't bewritten with a finite number of digits, and there is no 'last digit'.
Pi was discovered ny the ancient Greeks around 1900 B.C
Nobody has yet discovered the true value of pi in mathematics because it is an irrational number and its value is the circumference of any circle divided by its diameter is equal to pi which is impossible to work out.