There is no sensible answer to this question. Square feet is a measure of area, with dimensions [L2]. A millimetre is a measure of distance with dimension [L]. Basic dimensional theory teaches you that you cannot convert one to another without additional information.
31 x 11 = 341 square feet.
If the given dimensions are in feet then 39 times 31 = 1209 square feet
2,449 square feet.
5.56776436 feet.
9 square feet = 1 square yard Area = 31' x 50' = 1,550 square feet = 1722/9 square yards
Multiply square mm by 0.000010764 to get square feet.
1 square millimeter = 0.0015500031 square inches.
961 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
43' x 31' = 1,333 square feet.
17.007 square feet.
Answer: .31 acre = 13,503.6 ft²
992 square feet. Multiply length by width - the result is the area in square feet.