This question cannot be answered sensibly. A square millimetre is a measure of area, with dimensions [L2]. A millimetre is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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20 sq cm = 20*100 sq mm = 2000 sq mm
1 sq m = 100,000,000 sq mm
890 mm x 570 mm = 5.46 square feet.
Eight cm is equal to how many mm
35 mm