8.53973 (rounded)
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4 * 3.141592653589793 = 12.56637
pi was found when they realized that the radius of any circle is the amount of the perimeter multiplied by pi aka 3.14 and so on.
Formula for finding the circumference of a circle: 2 multiplied by pi multiplied by radius
The diameter multiplied by (pi)2 . That's about 9.87 times the diameter.
pi multiplied by the radius squared