588
Square feet is area, and area of a rectangle = LW
therefore, A=28x21
A=588
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12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
28*25 = 700 sq ft
2.6 square meters.
28 * 15 SQUARE feet = 420 sq ft = 39.02 sq metres.
9 sq ft = 1 sq yard so 28 ft * 18 ft = 28*18 sq ft = 56*9 sq ft = 56 sq yards.