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.
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It was a cool looking greek letter.
Pythagoras was the 1st person who used the pi symbol first
pi is greek for the number 3.14292 ect. It came from greek mathematicians thousands of years ago and is still used today
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
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.