It is not possible to answer the question because square feet are measurement units of area in 2-dimensional space. However, there are 3 dimensions to the size of the room in the question. That could imply that it is a triangular room or that these are measurements of the sides of a cuboid and the answer required is the total surface area of the room. Finally, the room is pretty small.
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320 sq feet.
There are: 16 times 9 = 144 square feet
Answer = 21 ft x 13 ft = 273 sq feet
If 25 and 9 are expressed in feet the area is 225 sq ft.
Answer = 38 feet x 11 feet = 418 sq feet