the Egyptians
3.141592654 rounded by the calculator
The ancient Babylonians were one of the first who gave it a value of about 3 but even today we do not know the exact value of pi only that a circle's circumference dividedby its diameter is equal to pi which is an irrational number because it cannot be expressed as a fraction.
pi is currently at 4 million digits
You take the circumference of a circle and divide it by the diameter.
While there is no fraction form for pi, 22/7 is an approximation of pi that can be used for a rough calculation .
The most accurate calculation of pi is currently estimated to be around 31.4 trillion decimal places. This calculation was achieved using supercomputers and advanced mathematical algorithms. However, for most practical purposes, using pi to just a few decimal places (3.14159) is sufficient.
Archimedes
The most accurate calculation of pi currently is 62.8 trillion digits, achieved by Timothy Mullican in January 2022 using the y-cruncher software. It took over 108 days to complete the calculation.
The circumference of a circle when divided by its diameter is the value of pi which is an irrational number that can't be expressed as an exact fraction.
Yes there once was a US state that tried to legislate the value of pi
And what use can you make of so many digits? 10-15 digits are more than enough for any practical calculation. Anyway, search Google for "digits of pi", and you'll get several places where pi is listed to many digits.