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扬州市2007年中考数学题中,出了一道有关旋转、对称的开放题:如图1,正方形ABCD绕点A逆时针旋转n°后得到正方形AEFG,边EF与CD交于点O.
In the 2007 mathematics question of Yangzhou City, there was an open question about rotation and symmetry: as shown in Figure 1, the square ABCD got a square AEFG around the point A by rotating counterclockwise by n°, and the edge EF and CD intersected at the point O.