The planet Mercury has a diameter of 4879.4 kilometers.
Nonsense is the measure of its diameter in mm.
But it is 4879400000 millimeters (4.8794 x 109 mm or about 5 billion 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
Its diameter in mm = 8/pi
and what does the 6 mm refer to? The diameter, presumably.
If the circle's circumference is 58 mm then its diameter is 58/pi which is about 18.462 mm