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小学奥林匹克数学竞赛A级初赛样题中有一道几何题:如右图,正方形ABCD的边长是4厘米,CG=3厘米,长方形DEFG的长:DG=5厘米,那么它的宽DE是多少厘米?
There is a geometric question in the Grade A Preliminary Olympiad of the Primary School Mathematical Olympiad Contest: as shown to the right, the side length of the square ABCD is 4 cm, CG = 3 cm, and the length of the rectangle DEFG is: DG = 5 cm. ?