如图,在四棱锥
中,底面ABCD是直角梯形,侧棱
底面ABCD,AB垂直于AD和BC,SA=AB=BC=2,AD=1,M是棱SB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/eecc847d-3654-4850-a209-c2e2d52535b2.png?resizew=236)
(1)求证:
平面SCD;
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/eecc847d-3654-4850-a209-c2e2d52535b2.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
更新时间:2022-10-08 11:06:47
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【推荐1】如图,在三棱柱
中,
面ABC,
,E为BC的中点,F为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721634579570688/2786484583915520/STEM/da644700-5121-4f4c-9639-017ada39535a.png?resizew=140)
(1)求证
平面
;
(2)求证
平面
;
(3)在棱
上是否存在点P,使得二面角
的大小是
,若存在,求出AP的长.若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80452a70287c799d86a294b72dd67951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300aefd67369742e2b1ddcdc02dd495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5048a0736cfe012cfc909e631e2a2969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6892aaa5a3869ed87fe23add134d6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0236d9dea89acb35d88f0857b38dbe.png)
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721634579570688/2786484583915520/STEM/da644700-5121-4f4c-9639-017ada39535a.png?resizew=140)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a6b40391f8aa6663f20ea4f96f3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909e7774480d6a72a716e7022dff8c99.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c80727dc62c17a4eb3587b6096f8f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133b1de5ad575e73778f1ebe4cb279f6.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c640abbdc470479407da1ae2aa80fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a76fda9c8419cb50501f5db886502e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
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【推荐2】已知四棱锥
(如图),四边形ABCD为正方形,面
面ABCD,
,M为AD中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/70a6dead-4a0c-44ff-849a-d76293a687eb.png?resizew=202)
(1)求证:
;
(2)求直线PC与平面
所成角的余弦值.
![](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/e7fcc62f1c0536d8f82409e8c8df7beb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/70a6dead-4a0c-44ff-849a-d76293a687eb.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789c9c79846abc6ba99cf3e575cdae6f.png)
(2)求直线PC与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03203dd5ac79dd8c6707e4340773359.png)
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【推荐3】如图,正方体
的棱长为2,点
,
分别在棱
,
上运动,且
.
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900497421312000/2902994678333440/STEM/d1c95403-b089-4222-b9e6-760e9a07d9c5.png?resizew=206)
(1)求证:
;
(2)求三棱锥
的体积的最大值:
(3)当
,
分别是棱
,
的中点时,求平面
与平面
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4919be81e61cabe21de00a2156d8b6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900497421312000/2902994678333440/STEM/d1c95403-b089-4222-b9e6-760e9a07d9c5.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7c16fcd117047c6c81ab37118e4c5.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72539b9a157e940a90b2b6bbcc5958ef.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bff3ccea5989c60e51e321af3f53f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22ebcc4aa98d46366df48f751a5f368.png)
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【推荐1】如图,在三棱柱
中,
为等边三角形,四边形
为菱形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ee8fdcbc-bda3-4794-81a8-f48995b5c207.png?resizew=171)
(1)求证:
;
(2)线段
上是否存在一点
,使得平面
与平面
的夹角的余弦值为
?若存在,求出点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c510b85dfbca0e3ab0744655d77e8c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ee8fdcbc-bda3-4794-81a8-f48995b5c207.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e5dc81fbafbe58bff0842f7776d80a.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】如图,在四棱柱ABCD-PGFE中,底面ABCD是直角梯形,侧棱垂直于底面,AB//DC,∠ABC=45o,DC=1,AB=2,PA=1.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572676493770752/1572676499972096/STEM/0373ca181da346c8bf55a9d3805f3346.png?resizew=203)
(1)求PD与BC所成角的大小;
(2)求证:BC⊥平面PAC;
(3)求二面角A-PC-D的大小.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572676493770752/1572676499972096/STEM/0373ca181da346c8bf55a9d3805f3346.png?resizew=203)
(1)求PD与BC所成角的大小;
(2)求证:BC⊥平面PAC;
(3)求二面角A-PC-D的大小.
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【推荐3】如图所示,在棱长为2的正方体ABCD-A1B1C1D1中,E,F分别为DD1,DB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/a8398966-78dd-42d8-aeaf-dabad428ca01.png?resizew=200)
(1)求证:EF∥平面ABC1D1;
(2)求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/a8398966-78dd-42d8-aeaf-dabad428ca01.png?resizew=200)
(1)求证:EF∥平面ABC1D1;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f8e0e8b630ed995d0184c6831363d0.png)
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