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the answer to that is 4cm
400mm equals 15.74 inches. Direct Conversion Formula400 mm* 1 in 25.4 mm = 15.7480315 in
400 millimeters is 0.4 meters.
0.4m2
.4 meters=400 mm
4 dm is greater than 400mm
400 mm = 1.31 feet, approx.
4
400mm = 0.4m 90cm = 0.9m 0.5m = 0.5m 0.9m > 0.5m > 0.4m, so 90cm is the longest.
600mm * 400mm = 0.6m * 0.4m = 0.24 sq metres
90cm is the longest because 400mm = 40cm and 0.5m = 50cm