Hint: try multiplying 20 and 40...
20 ft x 40 ft = 800 ft2 (or 800 square feet)
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To convert square feet to square meters, you would multiply by 0.0929. Therefore, for a 20ft x 20ft area, you would calculate 20ft x 20ft = 400 square feet. To convert this to square meters, you would multiply 400 by 0.0929, resulting in an area of approximately 37.16 square meters.
420 square feet. (21 x 20 = 420)
360ft² = 33.45m²
Since a square has right angles, you can use the Pythagorean Theorem to calculate the diagonal. Specifically, the diagonal of a square is equal to the length of a side, multiplied by the square root of 2.
20ft x 28ft = 560ft2