The question, as stated, cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A millimetre (mm) is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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The area equals the total square feet.
About 10.764 square feet.
200 square feet
One acre is 43,560 square feet.
100m2 is 1076.39 square feet.