If the circle's circumference is 58 mm then its diameter is 58/pi which is about 18.462 mm
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The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The circumference of a circle that is 16 mm in diameter is 50.27 mm
13 mm. The radius of a circle is 1/2 of the diameter.
The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
and what does the 6 mm refer to? The diameter, presumably.