By unit of length and distance and conversion ,we can say that
1 cm=10 mm
280 mm =28 mm
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28 cm (1 meter/100 cm)(1000 mm/1 meter) = 280 millimeters ============
280 meters = 11,023.622 inches.
25.4 mm in an inch
230 mm
9 cm and 3 mm is equal to 93 mm.