Pi = circumference/diameter
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They are: 2*pi*radius or as diameter*pi
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
Pi= c/dPi equals the circumference of a circle divided by the diameter. If the radius is presented, double the radius to find the diameter.The Wikipedia article in the related link, lists several formulas which have been used to calculate approximations of the number pi.
No. Pi is a finite number.
The first person to calculate pi was Archimedes, around 250 B.C. Using the formula:A = pi r^2