如图,在四棱锥P-ABCD中,PA⊥平面ABCD,底面ABCD为正方形,且PA=AD=2,E,F分别为AD,PC中点.
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852515793707008/2946933788164096/STEM/ea5a7d84-e6ad-401e-810a-300e7ba3a03d.png?resizew=181)
(1)求异面直线EF和PB所成角的大小;
(2)求证:平面PCE⊥平面PBC;
(3)求二面角E-PC-D的大小.
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852515793707008/2946933788164096/STEM/ea5a7d84-e6ad-401e-810a-300e7ba3a03d.png?resizew=181)
(1)求异面直线EF和PB所成角的大小;
(2)求证:平面PCE⊥平面PBC;
(3)求二面角E-PC-D的大小.
更新时间:2022-03-29 23:35:03
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【推荐1】如图所示的几何体中,
,
,
都是等腰直角三角形,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/4/6/2694181206810624/2694539678965760/STEM/52b511bee4a24a178226d6e9914995d9.png?resizew=224)
(1)求证:
平面
;
(2)若
为线段
的中点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
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![](https://img.xkw.com/dksih/QBM/2021/4/6/2694181206810624/2694539678965760/STEM/52b511bee4a24a178226d6e9914995d9.png?resizew=224)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b0cf5b0d834a512235f509878fc454.png)
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【推荐2】如图,在四棱锥
中,底面ABCD是正方形,AC、BD相交于点O,侧棱
底面
,
,E是PC的中点,过E作
交PB于点F,连FB接DF,BE.
![](https://img.xkw.com/dksih/QBM/2022/2/12/2915036850905088/2938442768924672/STEM/448a7d99a65141e896d4b570af6f13b9.png?resizew=366)
(1)求证:
平面
;
(2)设正方形边长为2,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d4c42112e0a22f240ce2ae432e5b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://img.xkw.com/dksih/QBM/2022/2/12/2915036850905088/2938442768924672/STEM/448a7d99a65141e896d4b570af6f13b9.png?resizew=366)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)设正方形边长为2,求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd1bc6147d69777b26a35d48522f7e.png)
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【推荐1】如图,正三棱柱
的所有棱长都为2,
为
中点.
![](https://img.xkw.com/dksih/QBM/2016/9/28/1573044902543360/1573044908900352/STEM/cc672b4c33c64e19b675c44140e3fb68.png?resizew=147)
(1)求证:面
面
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
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![](https://img.xkw.com/dksih/QBM/2016/9/28/1573044902543360/1573044908900352/STEM/cc672b4c33c64e19b675c44140e3fb68.png?resizew=147)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3a59d7bf91a7540e35ce0011ad9b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ae77736a8c5cf8b170a39ef3bfc4ac.png)
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【推荐2】如图,在几何体中,四边形
为菱形,
,
,
与
相交于点
,四边形
为直角梯形,
,
,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b3d8747b-cd4a-4fd7-a1eb-350f485b7b69.png?resizew=127)
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7852f839d64a8d081592179fc96535a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d2f152a8da561c9eeb6ba2ef091dc2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b6711e6dd48be6cf8fa52926924d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b3d8747b-cd4a-4fd7-a1eb-350f485b7b69.png?resizew=127)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c9c2c831a0552a7c934365bc49ad3f.png)
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【推荐1】如图,在四棱锥
中,底面
是矩形,
平面
,
,
,点
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/10/21/2833951030083584/2839988133871616/STEM/7db0bd4865b144b9bf91bdba892497e4.png?resizew=180)
(1)证明:
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f69c2c6e4bd53298288406d7046abb.png)
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![](https://img.xkw.com/dksih/QBM/2021/10/21/2833951030083584/2839988133871616/STEM/7db0bd4865b144b9bf91bdba892497e4.png?resizew=180)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f425530e551cab34cd06bd081ae228.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b5e290c6b2c5508a3bf6117afbf7e1.png)
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【推荐2】如图,在平行六面体
中,以顶点A为端点的三条棱长均为2,且它们彼此的夹角都是
,求直线
与直线AC所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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解题方法
【推荐1】如图1,在四边形ABCD中,
为DC的中点,
.将
沿BD折起,使点
到点
,形成如图2所示的三棱锥
.在三棱锥
中,
,记平面PEO、平面PDC、平面PBC分别为
.
;
(2)若
,求
与
的夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf364a6c2f5cd506c303b399483b64d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dbdc032a7f079ba6b0ff53865463a03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b215a2b3a2282ce790998ebaa2c34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a355393e8934620ee48f26cdb40f8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
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【推荐2】如图,在正方体
中,点
为
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/3/31/2431471868289024/2432969067405312/STEM/88e27382c10246fe99d018e8fe43af20.png?resizew=193)
(1)证明:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://img.xkw.com/dksih/QBM/2020/3/31/2431471868289024/2432969067405312/STEM/88e27382c10246fe99d018e8fe43af20.png?resizew=193)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f1592b2ad60fa438c2564ff651231f.png)
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