解题方法
1 . 四边形ABCD是矩形,
,点E,F分别是AB,CD的中点,将四边形AEFD绕
旋转至与四边形
重合,则直线
所成角
在旋转过程中( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7749006d7e99bbec95b12e044bf8f87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942cce96e2952c666c26814329faab0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.逐步变大 | B.逐步变小 |
C.先变小后变大 | D.先变大后变小 |
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