It is not possible to answer the question because you have filed to specify the units used for the dimensions of the room. It should be blindingly obvious to anybody that the square footage of a 9 ft x 6 ft room will be quite different from one which is 9 yards x 6 yards.
135
8' x 9' = 72 square feet.
216 sq ft
12 x 9 = 108 ft2
9 x 11 = 99
108sf
135
8' x 9' = 72 square feet.
12X9.6 = 115.2 Sq Ft.
It I'd 12 multiplied by 9 aka 108.
216 sq ft
9 x 11 = 99
12 x 9 = 108 ft2
16 by 9 is equal to 16 times 9....which is 144
Assuming the room is 9 ft by 14 ft (the question does not say so), the area would be 9*14 = 126 square feet
Assuming the room is 9 ft by 13 ft (the question does not say so), the area would be 9*13 = 117 square feet
For 9 ft x 20 ft = 180 ft²