Diameter of the circle: 31.4/pi = 10 miles rounded up
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Circumference of the circle: 38*pi in miles
Circumference of the circle = 1 times pi in miles
2,678,420 miles. By: SupeRMAn
Circumference of a circle is equal to pi*diameter, so if d=9miles, c=28.3miles (to 1dp).
d = 0.31831 miles.