The answer will depend on the units used for the measurements that are given in the question. Are the 9 ft x 12 ft or 9 inches x 12 inches or 9 miles x 12 miles? There is nothing in the question for preferring one rather than an other.
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12 x 9 = 108 ft2
108
113 ft
You can calculate the number of square feet in a two-dimensional rectangle by multiplying the length of one of the short sides by the length of one of the long sides. 9' x 12' = 108 square feet
180 square feet. Just multiply length by width - the answer is the square footage.