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Anonymous
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400mm = 0.4m 90cm = 0.9m 0.5m = 0.5m 0.9m > 0.5m > 0.4m, so 90cm is the longest.
Well a mm is half a cm so i think they are the same equivalent.
400mm
0.4m or 40cm or 400mm
a t.v can be 32' inches long