Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
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Pi can be used to find a circle, For the circumference-Pi x D, or for the radius Pi x r2
When was pi first being used approximated?
Pi is used to find the area and perimeter of a circle and the volume of a sphere, cylinder, and cone. Pi=3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196... That was 200 decimal places of Pi.
William Jones first used the pi symbol (π) in 1706
pi is used in many different formulas. Formula for circumference, Area of a circle, and as we all know, pi is an endless decimal but technically is not repeating