The ratio of the circumference to the radius of the circle is 2 times pi
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The answer depends on what the ratio is relative to!The ratio of a circumference to the area of a circle is half the radius.
It depends on the ratio of what of the circle? Its circumference, diameter, area?
It was inititially recognised as the ratio between the radius and circumference of a perfect circle. The radius times "Pi" equals the circumference of a perfect circle.
c = 2 pi r
The ratio of the circumference of a circle to its radius.