A diameter is a line though the centre of a circle (or circular shape). It is not a measurement unit and so the question cannot be answered. The question is like asking how to convert the side of a square to millimetres.
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Convert 600 mm into feet and use the formula: area = pi*radius2
18cm convert into mm
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).