A square metre is a unit of area. A centimetre is a unit of length. The two units are therefore incompatible.
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400 cm = 4 meters1,000 cm = 10 meters4 x 10 = 40 square meters
There are 100 cm in a meters. This means to convert 400 cm to meters, you need to divide by 100. There are 4 meters in 400 cm.
400 sq cm equals 0.43 square feet.
400 cm
4 metres = 400 cm