在棱长为1的正方体中ABCD=A1B1C1D1,M、N分别是AC1、A1B1的中点.点P 在正方体的表面上运动,则总能使MP 与BN 垂直的点P 所构成的轨迹的周长等于 .
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【知识点】 立体几何中的轨迹问题
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【推荐1】已知正方体
的棱长为
分别是棱
的中点,点P在四边形
内(包括边界)运动,则下列说法中正确的是___________ .
![](https://img.xkw.com/dksih/QBM/2021/7/30/2775263046066176/2782229442404352/STEM/3951bf9a-1f79-4e6c-b50d-f89f4ad91cd3.png?resizew=239)
①若P是线段
的中点,则平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
②若P在线段
上,则
与
所成角的取值范围为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb5de73caf22a6260dc3f8fe87a3908.png)
③若
平面
,则点P的轨迹的长度为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
④若
平面
,则线段
长度的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b684d2e78a0eb1b406913f2730e1d226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da62d9c339d604c5ffafc82fc54e2b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/30/2775263046066176/2782229442404352/STEM/3951bf9a-1f79-4e6c-b50d-f89f4ad91cd3.png?resizew=239)
①若P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2186f6b6a1eb231b4cbfd37d7fbaf745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
②若P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c798204bbe306b3efd5bc9eae594c171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb5de73caf22a6260dc3f8fe87a3908.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af48647583270e05d323883cb2d04a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d365ce9f4bacc4d4bb15dbdb5306a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee72dbf16db9bb8b5b51576a0619c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0a582c36d62d83c16425b2f54b4354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
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【推荐2】如图,正方体
的棱长为4,M为底面ABCD两条对角线的交点,P为平面
内的动点,设直线PM与平面
所成的角为
,直线PD与平面
所成的角为
若
,则动点P的轨迹长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3490f2c22393e71edfbf594f6b3203b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1504f849ae4eaa222b11e435203bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1504f849ae4eaa222b11e435203bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1486450f300f451e711d2238eaca1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1504f849ae4eaa222b11e435203bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d440e6ad6b95497fcb2e25c020bbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d086cb5ccbec0941d01ec1c36c13b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/cac1d26d-7f9c-4767-8e14-f40aa35bb803.png?resizew=155)
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