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
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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](/uploads/image/z/6977412-36-2.jpg?t=%E9%97%AE%E9%81%93GRE+For+a+project%2Ca+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.%E8%BF%99%E4%B8%AA%E9%A2%98%E6%88%91%E5%BE%97%E5%87%BA%E7%9A%84)
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
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,
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
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
正方形对折以后成长方形,设正方形边长为a,
长方形周长为:a+a+a/2+a/2=36,a=12;
正方形面积为:a^2=144