(12-ft x 21-ft) / (9 square feet per square yard) = 28 square yards
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12 * 9 = 108 square feet = 12 square yards
12 square yards but don't buy that, you will get a square. instead, simply ask for 9 feet by 12 feet or 3 yards by 4 yards
The area of the rectangle is 72 square feet
you can to this problem in 2 ways First you convert this room's measurement from feet to yard then get the answer. 9 feet by 12 feet = 3 yards by 4 yards (since 3 feet = 1 yard) 12 square yards Seconds way, you multiply room size in feet the divide square feet to square yards 9 feet by 12 feet = 108 square feet 1 sq yard = 3 feet by 3 feet = 9 square yard 108 divide 9 = 12 square yards
12' x 15' (180 square feet) = 20 sq. yards.