You can't, without knowing either the length or width, and anyway I think you're looking for volume/capacity which is measured in cubic feet.
90 square feet is around 8.361 square meters
7.5
The square footage of a circle that measures 159 feet in circumference is about 2,012 square feet.
There is no way to convert linear feet to square feet because the unit 'linear feet' measures length but the unit 'square feet' measures area.
200 square feet.
270 Square Feet.
182 square feet.
201.6 square feet.
200 square feet
56 SQUARE FEET
That is 64 square feet !
144 square feet.