There are 12 inches in one foot. Therefore, 840 inches is equal to 840/12 = 70 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.
12 inches per foot. 7 feet must be 84 inches so 70 feet is ten times that = 840
840 mm = 33.1 inches.
There are 30.48 centimetres in one foot. Therefore, rounded to two decimal places, 840 centimetres is equal to 840 / 30.48 = 27.56 feet.
840 square feet.