28 ft
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Doubling the width of a rectangular rug will affect the perimeter because the total length and width will be doubled. The area will be twice the length times the width.
12.25 feet2
you times the length by the width to get the area of any rectangular or square shapes
There are two equations that need to be known for this. The first is that the perimeter of a square is 4 times the side length. So in this case the perimeter is twelve feet, we know that the side length must be 3 feet. The other equation is that the area of a square is the side length squared. So in this case, the side length is 3 feet, so the area is 9 feet2
28