many sq.m in 6900mm
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1,800 mm x 310 mm = 0.558 sq meters.
'mm' millimetres is a measure of length. 1 sq. mtr' is a measure of area. However, there are 1000 mm in 1 metre. So in 1 m^2 there are 1000mm X 1000 mm = 1,000,000 mm^2
None but 20 mm = 2 cm
1 m = 1,000 mm 2 m = 2,000 mm 3 m = 3,000 mm 4 m = 4,000 mm 5 m = 5,000 mm 6 m = 6,000 mm
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