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A 30ft x 14ft room = 420 square feet.
121 sq ft
13ft * 11ft = 143 Sq feet.143 square foot = 13.28513472 square meter
103.04 ft2
If by square feel you mean square feet, and the rectangle is 10ft by 14ft, you simply multiply 10 by 14 to get 140, and then add the extension ft2, so the answer is 140ft2.