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Archimedes created the formula for measuring the circumference of a circle he used many-sided polygons, both inside and out to approximate it.
The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.
Formula of Circumference of a circle: 3.14*Diameter of the circle. You could also do: 3.14*3.14*radius.
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
Circumference of a circle = 2*pi*radius