三角尺AOB不动,将三角尺COD的OD边与OA边重合,然后绕点O按顺时针或逆时针方向任意转动一个角度

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三角尺AOB不动,将三角尺COD的OD边与OA边重合,然后绕点O按顺时针或逆时针方向任意转动一个角度
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