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.
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The plus symbol, "+", is used to indicate an addition.
Normally it is = which is an equality sign
Pythagoras was the 1st person who used the pi symbol first
"why" is not a mathematical symbol.
A cubic centimeter can be represented as cc or cm3. The symbol cc is used most commonly in medicine. The symbol cm3 is used most commonly in science and math.