解题方法
1 . 如图,四棱锥
中,
,
,
是正三角形,
,平面
平面
,若点F是
所在平面内的动点,且满足
,点E是棱PC(包含端点)上的动点,则当直线AE与CD所成角取最小值时,线段EF的长度不可能为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/eb89aa39-10bd-431f-9c7e-3b7f8d6716e5.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6045266f6db39e41b7abde762d9e9a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d9ef979b9f27a28cbda6923e888ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31cb7653522fe84e22e7c5ee117e8a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/eb89aa39-10bd-431f-9c7e-3b7f8d6716e5.png?resizew=161)
A.![]() | B.![]() | C.![]() | D.![]() |
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