See that 'x' that you wrote in the middle there between the 120 and the 180 ?
I know it means "by", but you can also go ahead and treat it as if means "times".
That's how you get the area.
(120-ft) times (180-ft) = 21,600 square feet.
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To convert from square feet to square yards, divide the number of square feet by 9. Example, a 10' x 12' room contains 120 square feet. 120 divided by 9 = 13.33 square yards.
You can not convert between feet and square feet - those two measure completely different things.
100 square feet.
10 feet x 12 feet = 120 square feet 120 square feet = 11.15 square metres
120 inches is a linear measurement, so there are zero square feet in 120 inches. For 120 inches2, however, as there are 144 square inches in one square foot (12 inches by 12 inches), there are 120/144 square feet in 120 square inches, or .833 ft2.