Multiply width by length to get the area. The answer would be 1440 square inches which would be 10 square feet.
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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 the two numbers and you get 1,800 square inches. Each square foot has 144 square inches. So you get 12.5 square feet.