问道GRE For a project,a square piece of cloth is folded in hal

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问道GRE
For a project,a square piece of cloth is folded in half and swed together to form a rectangle that has a perimeter of 36 centimeters.what was the area in square centimenters of the piece of cloth before it was folded.
这个题我得出的答案是48,正确的答案是144,

他求得是未折之前正方形面积
折成长方形后周长36 说明正方形原来边长12
所以面积是144

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