The answer depends on what the 59.66 refers to: radius, diameter?
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A circle with a radius of 2.3 units has a circumference of 14.45 units.
A circle with a circumference of 15pi (47.1238898 units) has a radius of: 7.5 units
The circumference of a circle with a diameter of 6 units is 18.85 units. (C = d x Pi).
A circle with a radius of 5 units has a circumference of 31.42 units.
circumference = diameter x pi = 12 units x 3.1416 = 37.7 units (approx)