Well a mm is half a cm so i think they are the same equivalent.
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0.4m or 40cm or 400mm
40
40cm times 40cm times 40cm equals 64,000cm. The volume of the cube is 64,000cm cubed or 0.064m cubed.
400mm = 0.4m 90cm = 0.9m 0.5m = 0.5m 0.9m > 0.5m > 0.4m, so 90cm is the longest.
The perimeter is 40cm