140 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
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Not quite sure what a sq rm is but assuming it is somehow related to a square metre, this question cannot be answered in a sensible way. A square metre is a measure of area, with dimensions [L2]. A centimetre is a measure of length, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
10
144
rm 1,900,000
No lone pairs