Question

问道GRE 数学题哈

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，谁能告诉我怎么做啊

Answer 1

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

Answer 2

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