(9-ft x 12-ft) = 108 square feet / (9 square feet per square yard) = 12 square yards
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Another method:
9-ft = 3 yards
12-ft = 4 yards
(3yd x 4yd) = 12 square yards
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A 12' x 9' room has an area of 12 square yards.
20 square yards
12 x 12 = 144 144 square feet
13.39 square meters.
20.07 square meters