25.4 mm = 1 inch (exactly)
⇒ 57 mm = 57 ÷ 25.4 inches
≈ 2.24 inches
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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
Two! a4 is 297x210 mm you can only get one across with 90mm left and 2 high with 57mm left