8.40 square inches = 54.19344 square centimeters.
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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.
There are 12 inches in one foot. Therefore, 840 inches is equal to 840/12 = 70 feet.
840 mm = 33.1 inches.
840 square feet.
sqrt(840)= 28.9828 (to 4 dp)