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
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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.
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
William Jones first used the pi symbol (π) in 1706