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The babylonians first discovered the ratio compared to the diameter and circumference of a circle.

Later, Archimedes(287-212BC) discovered and proved his theory of pi.

Pi to 27 decimal places:

3.141592653589793238462643383

The square root of pi (to 30 decimal places) is:

1.772453850905516027298167483314

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Q: Where did pi come from?
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