40' * 20 ' = 800 sq feet = 74.3 metres2
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If the floor area is 313 square meters, then the floor area is 313 square meters.
A square with a side length of 2.4 meters has an area of 5.76 square meters.
A square with a side length of 5.2 meters has an area of 27.04 square meters.
A square with a side length of 4.3 meters has an area of 18.49 square meters.
The side lengths of a square with an area of 60 square meters is: 7.746 meters.