已知四棱锥
的底面为直角梯形,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/0127b09f-e3d6-4a4a-a836-01542bc9e3f6.png?resizew=161)
(1)证明:平面
平面
;
(2)求异面直线
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0464b2b00ebe94143706e15796c6f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87830eb5bc4f4f02e706b1557173a2d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de217862f189f14a9ffa0c40f5368f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/0127b09f-e3d6-4a4a-a836-01542bc9e3f6.png?resizew=161)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
更新时间:2022-10-05 20:37:16
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相似题推荐
解答题-问答题
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【推荐1】已知四棱锥P﹣ABCD的底面为直角梯形,AB∥DC,∠DAB=90°,PA⊥底面ABCD,且PA=AD=DC=1,AB=2,M是PB的中点.
(Ⅰ)证明:面PAD⊥面PCD;
(Ⅱ)求直线AC与PB所成角的余弦值;
(III)求面
与面
所成二面角的余弦值.
(Ⅰ)证明:面PAD⊥面PCD;
(Ⅱ)求直线AC与PB所成角的余弦值;
(III)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c5ef850e256c98ca4f033999e61311.png)
![](https://img.xkw.com/dksih/QBM/2012/1/11/1570684119769088/1570684125216768/STEM/a9f31976be134b0b9de0c78c3151ec92.png?resizew=233)
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【推荐2】四棱锥
的底面是正方形,
,点E在棱PB上.若AB=
, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11ec89c13d5f80e5124b84829dfe180.png)
(Ⅰ)求证:平面
;
(Ⅱ)若E为PB的中点时,求AE与平面PDB所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e032eda669b7baf235f5733f9d79f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11ec89c13d5f80e5124b84829dfe180.png)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23caaeae0b4ab54270116a7e9f86a10.png)
(Ⅱ)若E为PB的中点时,求AE与平面PDB所成的角的大小.
![](https://img.xkw.com/dksih/QBM/2015/2/6/1571986073468928/1571986079277056/STEM/6ca0cc4d-f186-453c-a50c-0529fc923bc2.png)
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【推荐1】如图,在四棱锥
中,
面
,
,且
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/11/14/3109585270996992/3110723930808320/STEM/bc5fab02983c4cc2aa227d5aaa9bf944.png?resizew=209)
(1)求证:
平面
.
(2)求平面
与平面
夹角的余弦值;
(3)若点
为线段
上三等分点且靠近点
,求直线
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2022/11/14/3109585270996992/3110723930808320/STEM/bc5fab02983c4cc2aa227d5aaa9bf944.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250833a6c405ffd724b673b478c22919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐2】如图,四棱锥
的底面为矩形,
是四棱锥的高,
与
所成角为
,
是
的中点,
是
上的动点.
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619414123896832/1619414124322816/STEM/095ead0c-61e0-4e5d-bd43-51f97ea6a349.png?resizew=226)
(1)证明:
;
(2)若
,求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619414123896832/1619414124322816/STEM/095ead0c-61e0-4e5d-bd43-51f97ea6a349.png?resizew=226)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a395778dcf588264f40e1cd8c96206d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c310aa0cddf8c787c3d21b737475a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
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【推荐1】如图,在四棱锥
中,底面
为直角梯形,且
,∠
∠![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
,侧面
底面
.若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460516ee9c61f1bdd231759be0033e80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/c1eef449-9167-4036-b6c2-9337df0089f0.png?resizew=169)
(1)若
分别为
的中点,求直线
与
所成的角;
(2)
为线段
上一点,若平面
与平面
所成角的余弦值
,求
的值.
![](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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0342f7bc94dcc0576863e4803413b134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460516ee9c61f1bdd231759be0033e80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/c1eef449-9167-4036-b6c2-9337df0089f0.png?resizew=169)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e7344dca1e40bf072371ddd5640111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c7a937699f989b685f285041434000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57ea7dc7cacf9b48448ed06c78e030f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60b33b1b94b82e8972ae5c86de8ad66.png)
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【推荐2】如图,在长方体
中,已知
,
,
,
、
分别是线段
、
上的点,且
,点
到直线
的距离为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/35f58f06-be25-4c27-97ed-63375ef06596.png?resizew=228)
(1)求异面直线
与
所成角的大小;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e54ad0870e36726547ee79f6e093be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55176f6357df50f85d36b732e31972d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/35f58f06-be25-4c27-97ed-63375ef06596.png?resizew=228)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e54ad0870e36726547ee79f6e093be.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3906fd079e81869a710c9835dc8884a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/475d9dbaac17f65044500bd8fad9a135.png)
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