It could mean a circle with a diameter of 12.5 mm
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25.4 mm = 1 in → 125 mm = 125 ÷ 25.4 in ≈ 4.92 in
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
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).
Its diameter in mm = 8/pi