None.
A metre is a measure of length whereas a square metre is a measure of area. The two measure different things and it makes no sense to try to convert from one to the other. The question is like asking how many apples make one banana.
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1 square meter is equal to about 10.76 square feet. This means that 20 square meters is equal to 215.28 square feet.
200 square meter
A square with side lengths of 20 meters has an area of 400 square meters.
1 square meter = 10.764 square feet.
1 square meter is 10.764 square feet.