If 11.6 km is diameter, then 11.6 * pi = 36.4425 km circumference
If 11.6 km is radius, then 11.6 * 2 * pi = 72.8850 km circumference
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A circle with a radius of 1.8 km has a circumference of 11.31 km
Circumference of circle: 2*pi*13.1 = 82.30972752 km
36.92 just take the circumference and divide it by pi
Circumference = pi*2.5 = 7.85 km
C = 31.4 km