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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)
pi divided by 2
Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.
It is: pi*4^2 divided by 2 = 8/pi which is about 25 square cm
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