Pi = 355/113. That improper fraction is accurate to six decimal places. Pi is the ratio of a circle's circumference to its diameter. Please search on "Pi" using this site's search utility to find many questions that deal with it. Some links can be found below.
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It isn't clear what you mean. I don't think that "pi form" is a commonly used math term.
What is mean by acting
area of a circle (A), radius of circle(R): A=R^2
It means a rotation of pi radians (180 degrees).
The value for Pi for math is 3.14. Pi is the 16th letter in the Greek alphabet.