已知三棱锥
(如图一)及其展开图(如图二),四边形ABCD为边长等于
的正方形,
和
均为正三角形.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894173616365568/2895610469597184/STEM/9d2addbb-50c7-4805-b1ce-311bc2c73339.png?resizew=330)
(1)证明:平面
平面ABC;
(2)若点M在棱PA上运动,当直线BM与平面PAC所成的角最大时,求点M到平面PBC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894173616365568/2895610469597184/STEM/9d2addbb-50c7-4805-b1ce-311bc2c73339.png?resizew=330)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
(2)若点M在棱PA上运动,当直线BM与平面PAC所成的角最大时,求点M到平面PBC的距离.
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广西柳州市2022届高三第二次模拟考试数学(文)试题(已下线)易错点14 立体几何中的角-备战2022年高考数学考试易错题(全国通用)(已下线)专题21 空间向量与立体几何解答题20题-备战2022年高考数学冲刺横向强化精练精讲(新高考专用)
更新时间:2022-01-16 11:17:29
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相似题推荐
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥P—ABCD中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/e19caea0-0951-4a6a-bdfd-264e6fe95973.png?resizew=150)
(1)证明:
;
(2)若
,
,
,且点
到平面
的距离为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307d38cc7012c328f1f22aa793fe76d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f953fda6c082fcca3b377aec4be240f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/e19caea0-0951-4a6a-bdfd-264e6fe95973.png?resizew=150)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d85caf2bd9c6c66709d09df0ee0ac.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15eae3c2cb4274a947f6a011960934d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,在三棱柱
中,
平面
.点E是棱
的中点,已知
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/4/2628677695496192/2632357491474432/STEM/f1ddb64e-92b7-45a2-bd71-9133a41293d7.png?resizew=278)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6509ec857ea52888dda7bb3331fa57c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca06399cdf3e783cc60c0bae8713ffe.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2628677695496192/2632357491474432/STEM/f1ddb64e-92b7-45a2-bd71-9133a41293d7.png?resizew=278)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cbd2557ef69775b5a883c510091985.png)
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【推荐3】如图,已知棱柱
中,底面
是平行四边形,侧棱
底面
,
.
![](https://img.xkw.com/dksih/QBM/2017/5/8/1682702602084352/1684516673716224/STEM/bd9b5c01c593493c886e2b349ee68d51.png?resizew=235)
(1)求证:
平面
;
(2)求二面角
的平面角的余弦值.
![](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/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a51471ddc72972cdce9ae16748dd54f.png)
![](https://img.xkw.com/dksih/QBM/2017/5/8/1682702602084352/1684516673716224/STEM/bd9b5c01c593493c886e2b349ee68d51.png?resizew=235)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d027be176d18651cfd30f5492789ba.png)
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【推荐1】如图,直三棱柱
的体积为4,
的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/6/7/2996329638707200/2996337795588096/STEM/69a8d1db-07fd-4323-8cfb-bb50e374d35a.png?resizew=236)
(1)求A到平面
的距离;
(2)设D为
的中点,
,平面
平面
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1080295895df074480087279a84d7a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/2022/6/7/2996329638707200/2996337795588096/STEM/69a8d1db-07fd-4323-8cfb-bb50e374d35a.png?resizew=236)
(1)求A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)设D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeed487430a5b8a330f2d0c52166521a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
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【推荐2】如图,长方体
中,
,
与底面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/ebada64d-073c-4afc-ba7e-5c1f17cb337d.png?resizew=129)
(1)求棱锥
的体积;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/ebada64d-073c-4afc-ba7e-5c1f17cb337d.png?resizew=129)
(1)求棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fcc89972133de8acdc5dc5d4380600e.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
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【推荐1】如图所示的几何体中,四边形
是正方形,
平面
,
分别是线段
和
的中点,
.
(1)证明:
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7b6d04f024ca05cdfacc8ce9137c15.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b31fb036fa1bb4aa5edfd369f49b45b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/f7d99e8d-4b74-4494-8830-53c5cc0353db.png?resizew=139)
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【推荐2】如图,直三棱柱
中,
,
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641476457684992/2642974824054784/STEM/b3197f93-1222-4a4a-a1eb-4eeaecf7bdd3.png?resizew=200)
(1)证明:
平面
;
(2)求
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641476457684992/2642974824054784/STEM/b3197f93-1222-4a4a-a1eb-4eeaecf7bdd3.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8355349fbe4f1ff9350e411a621b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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【推荐1】如图,已知
中,
,
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a6d42741c7efe437d3af509ed7d569.png)
是
的中点.
![](https://img.xkw.com/dksih/QBM/2014/11/18/1571897601064960/1571897606979584/STEM/186496dabc3a4f1c91515925fa11fa8d.png)
(Ⅰ)若
是
的中点,求证:平面
平面
;
(Ⅱ)若
,求平面
与平面
所成的锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0fe7a934cca2a64cfdab0a37112368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f6152ad24a712c31e851d1ee6eb47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbe3ec31a79a171dcf274ff99e50762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a6d42741c7efe437d3af509ed7d569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b6b8f942fadb5961ffa1fe152e695f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2014/11/18/1571897601064960/1571897606979584/STEM/186496dabc3a4f1c91515925fa11fa8d.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84660017c064bb45bb8cd11eda3bac28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9839448fd9fc1777c0638195d26a78d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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【推荐2】在三棱锥
中,
的面积为
,点O为
的中点,
,
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/71fb188a-1b3f-4ea5-a2b8-2319b32b7747.png?resizew=203)
(1)求证:平面
平面
.
(2)E为线段
上的点,若
与面
所成的角为
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706e774dfd32305229cf4e06b36eecc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057f6cb15a3543d9080695003dde867c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/71fb188a-1b3f-4ea5-a2b8-2319b32b7747.png?resizew=203)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c309e58bf083bad13abd549720a63a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bf006d9cf9568dd567c25fd20a0c85.png)
(2)E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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