49 square feet
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Possibly 2 feet by 12 feet
The area is 49 square units.
All 4 sides of a square have equal length. If the perimeter is 28 ft, then the length of each side is 7 ft. In any rectangle, the area is (length) times (width). In the square, (length) times (width) is the same as (side squared). 72 = 49 square feet.
Its area is 49 square inches.
49 square centimetres.