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.
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It is 2.1875 square feet.
21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.
21 inches equals how many feet?
21*3 = 63 square feet.
There are 12 inches in one foot. Therefore, 21 inches is equal to 21/12 = 1.75 feet.