Pi can be used to find a circle, For the circumference-Pi x D, or for the radius Pi x r2
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When was pi first being used approximated?
the great pyramids did this.
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 (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.