1 mm = roughly 0.03937 inch (rounded)
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It is about 8.5 inches
There are 1,000 microns in a millimetre, taking a pin head of 1mm diameter then it must be 1,000 microns across.
If the circle has a RADIUS of 1mm then about 3,14 mm2 If the circle has a DIAMETER of 1mm then about 0,785 mm2
27.5 inches
46 inches