Usually a circle but its properties can also be applied to spheres
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pi did not use any professions! It was merely a number.
Because it is a non-repeating, non-terminating decimal. 22/7 is often used for pi, but it is only an approximation; there is no fraction that exactly equals pi. it goes on forever 3.14159265358979323846264338327950288419716.......
There is only one decimal point in the number 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.
Pi is a number that is never ending, but most people only use the first couple of digits. pi = 3.14159265 pi is the ratio of a circles' diameter to its circumference