1 in = 25.4 mm (exactly).
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1 inch = 25.4 mm 19 inches = 482.6 mm
25.4 mm = 1 inch 2 mm = 0.07874 inch (rounded)
Assuming that "1 inch round circle" refers to a circle whose circumference is 1 inch, its area is 51.34 sq mm.
1/16 inch = (1/16 * 25.4) = 1.5875 mm so, 4 mm = 4 / 1.5875 = 2.5197 sixteenths of an inch
127x177.8 mm if it was inches 1524x2133.6 mm if it was feet 1 inch= 25.4 mm 1 foot +304.8 mm