mathalets from the 3rd century in 130 ad from babylonian discovered that pi equals 3.14567789870989977890.....
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It was a cool looking greek letter.
Archimedes (287-212 BC) was the first to have had a serious attempt at calculating pi.
It was the ancient mathematicians of over 4000 years ago who then wrongly determined that the circumference of a circle divided by its diameter was equal to 3 But then as now the true value of pi has never been accurately determined but the method of calculating it remains the same.
Pi.
Any mathematician will use the number pi (and its symbol) sooner or later - it is a number used extensively in many different areas of mathematics.