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我们给定两个全等的正方形ABCD、AEFG,它们共顶点A(如图1),两个正方形可以绕顶点A旋转,以下各问题都以此为前提展开.
We give two congruent squares ABCD, AEFG, which have a total of vertices A (Figure 1), and the two squares can rotate around vertex A. The following questions are all based on this premise.