13mm is just slightly less than 1/2 inch (1/2 = 12.7 mm)
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The circumference of a circle with a diameter of 13 mm is: 40.84 mm
Diameter of circle: 13/pi = 4 mm rounded to the nearest integer
13 mm. The radius of a circle is 1/2 of the diameter.
The circumference of a circle that is 16 mm in diameter is 50.27 mm
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).