The Ancients had been using Pi for over 4000 years....
"We will probably never know who first discovered that the ratio between a circle's circumference and diameter is constant, nor will we ever know who first tried to calculate this ratio. The people who initiated the hunt for pi were the Babylonians and Egyptians, nearly 4000 years ago."....David Wilson,history of mathematics.
nobody knows when the relationship of twice the
radius to the circumference was originally discovered....though it's far from being "modern"
and could in fact be well over 4000 years old.
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