如图,已知棱长均为4的正四棱锥P-ABCD中,M和N分别为棱AB、PC的中点,过M和N可以作平面
使得
,则平面
截正四棱锥P-ABCD所得的截面面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de75c42d51b3cc20825b91f59ddf3c6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
更新时间:2024-05-21 17:18:02
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解题方法
【推荐1】如图,在长方体
中,底面
为正方形,E,F分别为
,CD的中点,点G是棱
上靠近
的三等分点,直线BE与平面
所成角为
.给出以下4个结论:
平面
; ②
;
③平面
平面
; ④B,E,F,G四点共面.
其中,所有正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca871e5520b69dada15eca7faa423b2b.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e120c066e17ba3eee00410cbed573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c1acd7da8817385417e1dff25bfe25.png)
其中,所有正确结论的序号为
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【推荐2】如图所示,在正方体
中,点
是棱
的中点,动点
在体对角线
上(点
与点
,
不重合),则平面
可能经过该正方体的顶点是______ .(写出满足条件的所有顶点)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/130d70f4-238e-4a4c-949e-55e0624b15d8.png?resizew=165)
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【推荐1】下列四个正方体图形中,
为正方体的两个顶点,
分别为其所在棱的中点,能得出
平面
的图形的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52173c8cc44246823c2bee21a783b731.png)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710370656493568/2814489957548032/STEM/ee97f255-6bdb-4af0-b787-f0da44dab942.png?resizew=544)
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【推荐2】如图,在梯形ABCD中,
,点E为AB中点,将
沿直线DE向上折起到
的位置(平面
与平面ABCD不重合).在折叠的过程中,给出下列结论:
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978517077884928/2978759161159680/STEM/98c37c0a-27e2-4ffe-bc78-c606cdb8a77f.png?resizew=204)
①任意时刻都有
∥平面
;
②任意时刻都有平面
平面
﹔
③存在某个位置,使得
﹔
④当平面
平面BCDE时,直线AD与平面
所成角的正弦值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
其中所有正确结论的序号是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ee449052976620d684ac52cd01fde1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a49088d8f4cae827c70a903191f7a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5df468bd3a6550726fe28c570d944d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978517077884928/2978759161159680/STEM/98c37c0a-27e2-4ffe-bc78-c606cdb8a77f.png?resizew=204)
①任意时刻都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5df468bd3a6550726fe28c570d944d.png)
②任意时刻都有平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c309e58bf083bad13abd549720a63a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9020f29b841a713951c5bdeab9039867.png)
③存在某个位置,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2ee4ddbaed4345f6dbc4ac1c43e78f.png)
④当平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7068c82a4a2f1522e06d23f284b69af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b216301e158565908ea0de16826efc2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
其中所有正确结论的序号是
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【推荐1】如图,已知
的外接圆为圆
,
为直径,
垂直圆
所在的平面,且
,过点
作平面
,分别交
于点
,则三棱锥
的外接球的体积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e052fa774304de59f3b6cd4b27600a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c3cc1f331dbb2248b0829039df7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82e1b9949d05ef17c0cd24eb9ff9e92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/25e59663-151c-484f-a43a-9c965479baea.png?resizew=233)
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【推荐2】在正方体
中,
分别为
和
的中点,则下列说法正确的序号有___________ .
①
四点共面;
②
平面
;
③
;
④
与
所成角为60°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a80427c5520818aa57e4de7bb5ce7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508b651e7ee34d9b3ea270996d794ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f381100e0074b86463a2176cee90f09.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7bfc1d0b50681765bd3fa6d5920ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8263493a370d77a1e6e19f331c970955.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa01740047e05b82a93ceb449e03cad.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
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