31400 / 3.141592653589793 = 9,994.93043
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The radius of a circle whose circumference is 36 pi (113.1) is: 18 (circumference divided by Pi divided by 2 = radius)
The Egyptians used 256 divided with 81 to calculate pi.
Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.
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