如图,在四棱锥S-ABCD中,底面ABCD是直角梯形,
,
,侧面
底面ABCD,
,
,M是棱SB上靠近点S的一个三等分点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/3dd92bf4-8b45-466f-b5fc-96a05b559838.png?resizew=206)
(1)求证:平面
平面SAB;
(2)求证:
平面SCD;
(3)若△SAB是边长为2的等边三角形,求直线SC与平面ABCD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/9/3dd92bf4-8b45-466f-b5fc-96a05b559838.png?resizew=206)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
(3)若△SAB是边长为2的等边三角形,求直线SC与平面ABCD所成角的正弦值.
更新时间:2022-07-08 11:44:13
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【推荐1】如图,四棱柱
中,四边形
为矩形,且平面
平面
,
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922734306738176/2927423329067008/STEM/74b21ec5-9053-4db3-8ad8-5fe272f5f12d.png?resizew=203)
(1)证明:
平面
;
(2)求
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22ebcc4aa98d46366df48f751a5f368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f67c2d29909f744a60448e409f0fbab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04415900de76e34c2d45431f4569382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2324805c5dfe2a35787bc3af840586ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922734306738176/2927423329067008/STEM/74b21ec5-9053-4db3-8ad8-5fe272f5f12d.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9881fa5ebb7a73ee0f744df6baceb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b54387f870ae37f7951b253665d64f6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
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【推荐2】如图点P为矩形ABCD所在平面外一点,PA⊥平面ABCD,
点E为PA的中点,
(1)求证:PC∥平面EBD;
(2)求异面直线AD与PB所成角的大小.
点E为PA的中点,
(1)求证:PC∥平面EBD;
(2)求异面直线AD与PB所成角的大小.
![](https://img.xkw.com/dksih/QBM/2018/1/2/1851570057994240/1852420747329536/STEM/41d8da669ed04944aa42b40233304f4e.png?resizew=178)
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【推荐1】如图,四棱锥
中,
平面
,底面
是正方形,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/7bd48798-c1db-4297-ad0e-b5095315a2e6.png?resizew=215)
(1)求证:
平面BDE;
(2)求直线AE与平面ABCD所成角的正弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99926bf272cd757f0985c69b390ebcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/7bd48798-c1db-4297-ad0e-b5095315a2e6.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
(2)求直线AE与平面ABCD所成角的正弦值.
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【推荐2】如图,在三棱柱
中,侧棱
底面
,底面
是等腰直角三角形,且
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570039567024128/1570039572291584/STEM/510e068872744604a15e25fa63f356b9.png?resizew=203)
(1)求证:
平面
;
(2)求直线DM与平面
所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cfa6b4db3a67fcd3c169fd8502a66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137344b171c1ec8f0310a12ad889291a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824f43659734139984bbea0c2084541b.png)
![](https://img.xkw.com/dksih/QBM/2011/3/14/1570039567024128/1570039572291584/STEM/510e068872744604a15e25fa63f356b9.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f06fe9ff40374bbcecbb42d7e89339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5a8d62bf734230c978cb2baf5b03cc.png)
(2)求直线DM与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
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【推荐3】如图几何体中,底面
为正方形,
平面
,
.且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/40dab380-2862-43ae-a7c5-a5e89541d136.png?resizew=154)
(1)求证:
平面
;
(2)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/b73f874048f9e48ae35ee95bbf443bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a6e07a3ef8f3969afb82f91e6ae4ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/40dab380-2862-43ae-a7c5-a5e89541d136.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
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【推荐1】如图,在三棱柱ABCA1B1C1中,AB AC,点E,F分别在棱BB1 ,CC1上(均异于端点),且∠ABE∠ACF,AE⊥BB1,AF⊥CC1.
求证:(1)平面AEF⊥平面BB1C1C;
(2)BC // 平面AEF.
求证:(1)平面AEF⊥平面BB1C1C;
(2)BC // 平面AEF.
![](https://img.xkw.com/dksih/QBM/2018/3/30/1913132874948608/1913496027504640/STEM/9fd884b7acb544ca80b929918d88ab6d.png?resizew=233)
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【推荐2】如图,四棱锥
的底面
为平行四边形,
底面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/a72c8a83-315a-45ff-8186-88e0ddb0af0d.png?resizew=188)
(Ⅰ)求证:平面
平面
;
(Ⅱ)在侧棱
上是否存在点E,使
与底面
所成的角为45°?若存在,求
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/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/e075468e7fb0bf30229aec01a7205977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e713f0ba80e87438cf6273fb00cb81a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/a72c8a83-315a-45ff-8186-88e0ddb0af0d.png?resizew=188)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fd62e77db4a587a7c3a0f9044cc216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(Ⅱ)在侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add47889f6b4911133999a898d3666d3.png)
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