如图,已知△
中,∠
=90°,
,且
=1,
=2,△
绕
旋转至
,使点
与点
之间的距离
=
.
(1)求证:
⊥平面
;
(2)求二面角
的大小;
(3)求异面直线
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971cd0358b49f1661adc674801bd6ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26552dfc6fd1c06859940cbb36e6ef3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4167feb456b79187e3582a90bdc0ffb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5427b3e28d3a34a59e2f7ceacd3d5f0b.png)
![](https://img.xkw.com/dksih/QBM/2012/2/9/1570725467234304/1570725472755712/STEM/84a336be38504a12aac70955f27dfa2c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251face19753cbbe1d24e185e3d0eebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26552dfc6fd1c06859940cbb36e6ef3f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/470b575ff8c4466b820756f9a630fbeb.png)
(3)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d80d617cab2850dd9c7397ca458456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2012/2/9/1570725467234304/1570725472755712/STEM/c8014740af7246f79dd86f9818df58e5.png)
2012高三·广东肇庆·专题练习 查看更多[5]
(已下线)2012届广东省肇庆市封开县南丰中学高三数学复习必修2模块测试试卷D卷(已下线)2011-2012学年吉林省吉林市普通中学高一上学期期末数学试卷福建省厦门市双十中学2018-2019学年高一下学期期中数学试题(已下线) 专题20 立体几何角的计算问题(练)-2021年高三数学二轮复习讲练测(新高考版)(已下线)专题24 立体几何角的计算问题(练)-2021年高三数学二轮复习讲练测(文理通用)
更新时间:2019-01-30 18:14:09
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解答题-问答题
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适中
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名校
【推荐1】如图,在四棱锥
中,
面
,
,
为线段
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/47447b69-4e20-4f6c-adde-a0e7cbb35ea8.png?resizew=178)
(1)证明:
平面
;
(2)若
是
的中点,求
与平面
所成的角的正切值;
(3)在(2)的条件下求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/85a9249c3b4c6e22262c6bac3cafccf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76ce75f28a122167457b390eda064e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/47447b69-4e20-4f6c-adde-a0e7cbb35ea8.png?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(3)在(2)的条件下求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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【推荐2】如图,已知正方体
的棱长为
,
,
分别是棱
与
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/6bf26bea-f630-4c1b-81c0-3b23e1bd9643.png?resizew=173)
(1)求以
,
,
,
为顶点的四面体的体积;
(2)求异面直线
和
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/6bf26bea-f630-4c1b-81c0-3b23e1bd9643.png?resizew=173)
(1)求以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c798204bbe306b3efd5bc9eae594c171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e935bb9d7b7115429edbd1e7469af65.png)
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【推荐1】如图,在四棱锥
中,平面
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/f6a9e8ed-d303-4ab1-985c-0d892f27c925.png?resizew=219)
(1)证明:
平面
;
(2)线段
上是否存在一点
,使得
与平面
所成角的正弦值为
?若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e45b6f8cf0260912f587c04f9f2442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0335b703becb783ea1902d628dbacafc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01510a5e33071204860456f2f3dfcc1d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/f6a9e8ed-d303-4ab1-985c-0d892f27c925.png?resizew=219)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4510d0a6828f0555004a9356043c0312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1612a0a4df3353fba4da6678c6a0cf4b.png)
您最近一年使用:0次
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适中
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解题方法
【推荐2】如图,在直三棱柱
中,
,
,点
为
的中点,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1c35cfff-f4cd-4802-bf36-83ecf8f0db07.png?resizew=143)
(1)证明:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51a4b0c34bf6e17ed63d1968659daf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6411e58e13ebdc390255a368523ba049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/1c35cfff-f4cd-4802-bf36-83ecf8f0db07.png?resizew=143)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c4f474f2c144be8703517ef72b98a7.png)
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【推荐1】如图,已知矩形ABCD所在平面外一点P,
平面ABCD,E,F分别是AB,PC的中点.且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/de010fc4-6b31-4d4c-904a-d818642a0ba7.png?resizew=182)
(1)求EF与AD所成的角;
(2)求平面EFB与平面ABCD所成锐二面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/29/de010fc4-6b31-4d4c-904a-d818642a0ba7.png?resizew=182)
(1)求EF与AD所成的角;
(2)求平面EFB与平面ABCD所成锐二面角的大小.
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解题方法
【推荐2】如图,在四棱锥
中,底面ABCD为直角梯形,且
,
,
,
,平面
平面ABCD,点M在线段PB上,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
平面MAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/069283ef-3933-49af-814e-9733ef78e143.png?resizew=187)
(1)判断M点在PB的位置并说明理由;
(2)记直线DM与平面PAC的交点为K,求
的值;
(3)若异面直线CM与PA所成角的余弦值为
,求二面角
的平面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e57af480a5e2c688723d762b822fa51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25eb757d05fbff80d50c3bb8dbcb8657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/069283ef-3933-49af-814e-9733ef78e143.png?resizew=187)
(1)判断M点在PB的位置并说明理由;
(2)记直线DM与平面PAC的交点为K,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da959c0ba06e6e3817ba8adafdac1c6.png)
(3)若异面直线CM与PA所成角的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daffe333e60992bb4590370b79b806d5.png)
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【推荐3】在如图所示的圆柱
中,AB为圆
的直径,
是
的两个三等分点,EA,FC,GB都是圆柱
的母线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
平面ADE;
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3d34e4702615fa0e908eda9440c93c.png)
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
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