There are: 16 times 9 = 144 square feet
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320 sq feet.
The dimensions of the room would be 16 feet by 16 feet, as the square root of 256 is 16.
Answer = 16 x 19 sq feet = 304 sq feet
256 on the floor. 256 on the ceiling. More on the walls, but we can't calculate them without knowing the height of the room.
Answer = 21 ft x 13 ft = 273 sq feet