other math teachers in 1988 this means nothing
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Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
Pythagoras was the 1st person who used the pi symbol first
It was a cool looking greek letter.
The ancient Greeks did the original work of inventing geometry as we know it, and pi is a letter in the Greek alphabet, so it was a convenient symbol for them to use.
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.