A 57mm diameter would be the distance across a circle, measured from one point on the circumference, passing through the center, to the opposite point on the circumference. In practical terms, it would be slightly less than the width of a standard credit card, which is about 85.60mm x 53.98mm. Visualizing it, a 57mm diameter circle would be slightly larger than a US half dollar coin, which has a diameter of 30.61mm.
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Diameter means that you're talking about something that's round, either like a ball or like a pipe. 57 mm is just a little more than two inches, like 2 1/4".
Well, honey, if the diameter of a circle is 57mm, then the radius is half of that, which is 28.5mm. The circumference of a circle is calculated using the formula C = 2πr, so plug in the radius and you get a circumference of about 179.11mm. So, there you have it, darlin', the circumference of that circle is approximately 179.11mm.
Bottle caps are about 2 cm in diameter.
It looks like an extra large pizza which has a diameter of 18 inches
2052 square millimetres.
57 mm = 5.7 cm