11.3 square feet.
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30 feet by 28 feet equals 840 square feet. 30 inches by 28 inches equals 840 square inches, or 5.833 square feet.
864 square inches
2.127 square feet.
9 square feet = 1,296 square inches.
2 feet 6 inches is equal to 30 inches.30 inches times 10 inches is equal to 300 square inches.