pi times diameter = circumference
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Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
Because of the radius of the circle
Pi = circumference/diameter
pi*radius2 = area radius = square root of (area/pi) circumference = 2*pi*radius