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Q: How many square inches in 21 square feet?

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14.4375 square feet.

61" x 21" = 8.89583 square feet.

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It is 2.1875 square feet.

19 feet 1 inch by 21 feet 10 inches = 416.65 square feet.

21 square feet.

144 square inches = 1 square footArea = (216-in x 14-in) = 3,024 square inches = 21 square feet

Multiply the two together to get 294 square inches. Divide by 144, the number of square inches in a square foot, and you get 2.04.

1 foot = 12 inches(1 foot)2 = (12 inches)2 = (12)2 x (inches)21 square foot = 144 square inches2 square feet = 288 square inches..24 square feet = 3,456 square inches

32*21 = 672 sq inches = 672/(12)2 = 42/3 sq feet

I assume you mean a rectangle. You can:* Convert everything to feet, then multiply; or: * First multiply, then divide the result (which is in square inches) by 144, to convert to square feet.

21 feet is 252 inches

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