Circumference = 2*pi*r = 2*pi*4 = 25.13 inches (approx).
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Area = pi*r2 = 50.265 sq inches Circumference = 2*pi*r = 25.133 inches.
circumference = 4*pi inches
If a circle circumference is 30 the radius is: 4.77
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle with a circumference of 59 is: 9.39