Pi is an irrational number, can not be represented as a fraction or repeating or terminating decimal, therefore to write it as a number it must be rounded off or estimated.
Many formulas can cancel or reduce out the value for pi and make for short work of the number.
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Pythagoras was the 1st person who used the pi symbol first
it is a number 3.14159265358979323846264338327950288... it's just a lot of numbers after that
in terms of pi- when using the symbol for pi instead of 3.14 or 22/7 in the end result of an equation
Pi as a symbol was first used by the English mathematician William Jones. In 1706 he wrote that 3.14159=Euler, in 1737, used this symbol and it became the worlds standard symbol for pi after that.
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.