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A square centimetre is a unit of area. A millimetre is a unit of length. The two units are therefore incompatible.
10.5cm
A centimetre, at least, because otherwise it would be called something else. It could be a millimetre but not a smaller unit.A centimetre, at least, because otherwise it would be called something else. It could be a millimetre but not a smaller unit.A centimetre, at least, because otherwise it would be called something else. It could be a millimetre but not a smaller unit.A centimetre, at least, because otherwise it would be called something else. It could be a millimetre but not a smaller unit.
A centimetre, although you could use a millimetre for greater accuracy.
It could be, but it could also be 1.06 metres. People often talk in terms of metre-and-centimetre combinations, not decimetres or millimetres.