名校
1 . 如图.直四棱柱
的底面为菱形,且
分別是上,下底面的中心,
是AB的中点,
.
时,求直线
与直线EC所成角的余弦值;
(2)是否存在实数k,使得
在平面EBC内的射影
恰好为
的重心.若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b65b385b55acf7db8cd3f85a2327abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5254f01a199d19ac9a1371d87249336e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
(2)是否存在实数k,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
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名校
2 . 如图,正三棱柱
中,
,
.设点D为
上的一点,过D,A作平面
的垂面
,
与正三棱柱
表面的交线(保留作图痕迹,不需证明);
(2)若
到平面
的距离为
,求AC与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
2024-04-10更新
|
792次组卷
|
2卷引用:2024届贵州省贵阳市高三下学期适应性考试数学试题
名校
3 . 如图,在正四棱锥
中,
,已知
,
,其中
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/4df670e4-b610-45a4-8d38-e7463c86e48a.png?resizew=165)
(1)证明:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be56dffe9a3e5d3e67aefca32248cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/4df670e4-b610-45a4-8d38-e7463c86e48a.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1a0960168db81133542d3c143bdf0d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8e83915a02eae9969fba7c73ee6e2b.png)
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解题方法
4 . 如图,四棱锥中,底面是边长为2的正方形,
是以
为斜边的等腰直角三角形,
平面
,点
是线段
上的中点,
是
的中点.
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
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解题方法
5 . 在正方体
中,
分别是棱
和
上异于端点的动点,将经过三点
的平面被正方体截得的图形记为
.如图中
时截面图形
为矩形.
(1)在图中作出截面图形
为梯形的情形;(直接画出图形即可,不需说明)
(2)当点
为
中点时,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ae536809b1161fd4e83fdc7f42be96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d04ea588f556c3b874b7e68ea69f49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/5db5de67-b86d-4aaf-b4be-12f24a3ef879.png?resizew=164)
(1)在图中作出截面图形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
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名校
解题方法
6 . 如图,已知正三棱柱
中,点
分别为棱
的中点.
三点的平面,交棱
于点
,求
的值;
(2)若三棱柱所有棱长均为2,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef4495309b23e5218be6f611d04c38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d04ea588f556c3b874b7e68ea69f49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa42972cb820341ce92fa2e33f9389fa.png)
(2)若三棱柱所有棱长均为2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
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2023-08-02更新
|
442次组卷
|
3卷引用:贵州省三新改革联盟校2022-2023学年7月高二下学期期末联考数学试题
贵州省三新改革联盟校2022-2023学年7月高二下学期期末联考数学试题(已下线)第一章 空间向量与立体几何(知识归纳+6类题型突破)-2023-2024学年高二数学单元速记·巧练(人教A版2019选择性必修第一册)广东省佛山市顺德区罗定邦中学2024届高三下学期冲刺实战演练数学试卷
解题方法
7 . 如图,在四棱锥
中,侧面
是正三角形,且与底面
垂直,已知底面
是菱形,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/77e2ca8e-b809-4782-966c-ef5b7ee70557.png?resizew=178)
(1)求证:
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03977f376d19e1ba2e50881e511e3e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/77e2ca8e-b809-4782-966c-ef5b7ee70557.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe67036b4671b5d2a5c55b48c4d3bb9.png)
您最近一年使用:0次
名校
8 . 在正四棱柱
中,O为
的中点,且点E既在平面
内,又在平面
内.
(1)证明:
;
(2)若
,
,E为AO的中点,E在底面ABCD内的射影为H,指出H所在的位置(需要说明理由),并求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/b5b5d8c7-01db-4427-95f6-f526bc242d3f.png?resizew=143)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06537cb9306dafa4c221cfced82a2ce4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8a295e9474afc5e3628832bd3724f1.png)
您最近一年使用:0次
2023-05-26更新
|
267次组卷
|
3卷引用:贵州省凯里市第一中学2023届高三模拟考试数学(文)试题
名校
解题方法
9 . 在正四棱柱ABCD-A1B1C1D1中,O为CD1的中点,且点E既在平面AB1C1内,又在平面ACD1内.
(1)证明:E∈AO.
(2)若AA1=4,E为AO的中点,且
,求正四棱柱ABCD-A1B1C1D1的侧面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/26/ac110b6c-40a2-4630-82a0-9ff8395c2c5d.png?resizew=150)
(1)证明:E∈AO.
(2)若AA1=4,E为AO的中点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcea56a8dc4a7752b2e1d0b1f4748aa0.png)
您最近一年使用:0次
2023-05-25更新
|
573次组卷
|
5卷引用:贵州省凯里市第一中学2023届高三高考模拟预测数学(理)试题
名校
解题方法
10 . 如图1所示,在边长为3的正方形ABCD中,将△ADC沿AC折到△APC的位置,使得平面
平面ABC,得到图2所示的三棱锥
.点E,F,G分别在PA,PB,PC上,且
,
,
.记平面EFG与平面ABC的交线为l.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/6c137775-a663-4601-94f9-c773c9f1b07a.png?resizew=408)
(1)在图2中画出交线l,保留作图痕迹,并写出画法.
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1095b030f441de5fb223781b00f3dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715ef932b72eb703f3e7a17ee2ce6a7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1828795d52174dd64fba1c9ebe61072b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cf0ee918f8c2f753302d3b5928d358.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/6c137775-a663-4601-94f9-c773c9f1b07a.png?resizew=408)
(1)在图2中画出交线l,保留作图痕迹,并写出画法.
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
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