30 * 36 = 1080 square inches = 1080/144 = 7.5 sq. feet.
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Approximately 23.3 square feet.
30 feet by 28 feet equals 840 square feet. 30 inches by 28 inches equals 840 square inches, or 5.833 square feet.
Area calculation: 30 inches by 30 inches = (30 x 30) square inches =900 square inches or, if you want square feet instead: 12 inches x 12 inches (1 square foot) = 144 square inches Take your 900 square inches and divide by 144 to get square feet. 900 / 144 = 6.25 square feet
2.5 Square feet is 30" x 30" or 360 Square Inches
9'10" * 30' = 910/12 * 30 = 295 square feet