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.
15 square feet.
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches
7.5 square feet.
51 inches wide x 30 inches long = 10.625 square feet.
Multiply width by length to get the area. The answer would be 1440 square inches which would be 10 square feet.
30 inches by 5 feet = 12.5 square feet.
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
7.5 square feet.
Approximately 23.3 square feet.
51 inches wide x 30 inches long = 10.625 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