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 (π) is calculated as the ratio of a circle's circumference to its diameter. Therefore, the two numbers used to calculate pi are the circumference of the circle and its diameter. This relationship holds true for all circles, making pi a constant approximately equal to 3.14159.