784 square feet
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728 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
Well, darling, a 4x7 rectangle has 28 square feet. It's as simple as multiplying the length by the width. So, next time you need to calculate the square footage of a room, just remember this little nugget of knowledge.
20ft x 28ft = 560ft2
28 feet contains 28 feet.
To find the square footage of a rectangular area, you multiply the length by the width. In this case, 20 feet x 28 feet equals 560 square feet. Therefore, a house with dimensions of 20 feet by 28 feet has a total area of 560 square feet.