30 inches by 10 feet = 25 square feet.
5 square feet
15 square feet.
30 * 36 = 1080 square inches = 1080/144 = 7.5 sq. feet.
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches
51 inches wide x 30 inches long = 10.625 square feet.
7.5 square feet.
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
Multiply the two numbers and you get 1,800 square inches. Each square foot has 144 square inches. So you get 12.5 square feet.
2.5 Square feet is 30" x 30" or 360 Square Inches