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25.4 mm = 1 inch (exactly) ⇒ 57 mm = 57 ÷ 25.4 inches ≈ 2.24 inches
57 mm = 5.7 cm
2052 square millimetres.
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.
57mm