It is 100*pi : 1 or approx 314.159:1
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There is no direct ratio. The area is related to the square of the radius by the factor "pi." A = (pi) r2 (Pi is about 3.1416)
Because the ratio of the circumference of any circle to its diameter is pi.
C = pi x D is the ratio of a circle's circumference to its diameter.
Pi is the ratio of circumference to diameter. C/d=pi always!!!
The ratio is pi, a transcendental number, which is a subset of irrational numbers. pi is approximately equal to 3.14159