The ancient Greek mathematician Pythagoras is usually creditted for the discovery of the ratio of circumference to radius of circles. That is, Circumference = 2 * Pi * Radius. The number Pi represents (3.1415....) is named after him.
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The circumference of a circle is the perimeter of the circle for a given diamater.
The circumference of a 9 circle is: 28.3
The circumference of a 36 circle is: 113.1 (diameter x pi = circumference).
The circumference of a circle that is 5mm is: 15.7 mm
No, the circumference of the circle divided by the diameter is pi.