如图,在四棱锥
中,侧面
底面
,底面
为矩形,
,
.
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db3940f180ba6947c2edcfaf4431e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781c38c2ca51beb16eeebce1f843fe01.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/2b82fa8f506f8099ca06c36c706db479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff50f835a78636c5d0e78a917fd4abb1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753d9059ea17319dfa503b6003d6138.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://img.xkw.com/dksih/QBM/2018/5/4/1938155828674560/1939602241552384/STEM/d18f03b5ea254153b50b56d6849a2a66.png?resizew=244)
更新时间:2018-05-06 18:33:46
|
相似题推荐
【推荐1】如图1,在直角梯形
中,
,点
,
分别是边
的中点,现将
沿
边折起,使点
到达点
的位置(如图2所示),且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/b2a67682-25e2-4695-8839-92d529a49d12.png?resizew=284)
(1)求证:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db431465b146deef3c7cdc51d916f57e.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/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/b2a67682-25e2-4695-8839-92d529a49d12.png?resizew=284)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94150b3de8f92462598101d4adc17dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e106f4233be16e98f2c1bf9f1635622.png)
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适中
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【推荐2】四棱锥
的底面
为直角梯形,
,
,
,
为正三角形.
![](https://img.xkw.com/dksih/QBM/2018/4/9/1920593719861248/1920931115589632/STEM/d628e379b2664301a6b46bc47d77b9d1.png?resizew=197)
(1)点
为棱
上一点,若
平面
,
,求实数
的值;
(2)求点B到平面SAD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f08faa7f1550cb3732de12b2be5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5408641691fd27f6dd8cf0ab2043ad4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5034a973110e2a6eb2e7d5699c24f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147f89f451e3609470bb2a661551fdc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6afc1323bc706c5c9495f4f47fb27b0.png)
![](https://img.xkw.com/dksih/QBM/2018/4/9/1920593719861248/1920931115589632/STEM/d628e379b2664301a6b46bc47d77b9d1.png?resizew=197)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a6b190811e7735c33b1177ba2c0de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a5d8db8a256cfce2b620ea92229f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5d1e89c62c5692678044f85572bf34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)求点B到平面SAD的距离.
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解答题-证明题
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适中
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【推荐1】如图,四边形
为梯形,
,
,
,
,
,点
在
上,且
.现沿
将
折起至
的位置,使
.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958751621644288/2962082452348928/STEM/4d626cfe-ca26-4782-8af8-27c64e3dbbba.png?resizew=343)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953f11eb95bfc036d85b472f81c6fb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b6d3947d1ac5a2942ae58183acedf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e340674361f3742dd118ccc82d23c741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16dbbc3b3b87c64f4570b068749228b1.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958751621644288/2962082452348928/STEM/4d626cfe-ca26-4782-8af8-27c64e3dbbba.png?resizew=343)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604a7e1e37d514c1dd84b07d85e7cbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642401af2d7fc2de640ff7f6a8715950.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在直三棱柱
中,
是
的中点,
与
交于点
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/12/20/2100858812055552/2102882785034240/STEM/ee41e3e90e474925bd5b22b5b0c0e88d.png?resizew=113)
(1)求证:
;
(2)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://img.xkw.com/dksih/QBM/2018/12/20/2100858812055552/2102882785034240/STEM/ee41e3e90e474925bd5b22b5b0c0e88d.png?resizew=113)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afdd952f0c2efda54a6b8fc96ef59b7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
您最近一年使用:0次
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名校
【推荐3】如图,在三棱锥
中,
,点
在平面
内,点Q在AB上,且满足
.
(1)过Q作AB的垂面
,分别交BC于E,交BD于F,过B作
交CD于点M,证明:
;
(2)当PQ与平面
所成最大角的正切值是
时,求此时PQ与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/b4d9a047-f988-41b2-bb4a-3a89ede50169.png?resizew=154)
(1)过Q作AB的垂面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1657f0781f2d325a939ebc926e4f4f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262ba9641d1dada44105a5cf7230b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c9c9ccb1f2accde19b3ca9920a845c.png)
(2)当PQ与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519bd215d019509fa2d88e57f145a896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在四棱锥
中,底面
是边长为
的菱形且中心为点
,
,且点
在底面
上的投影为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/97e8237b-dae2-4ee0-93ac-4c04aa01340d.png?resizew=171)
(1)若
为
的中点,求证:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead7c62c40bd5d19a478eee3c11957cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a5ef83b3287388f352eba937280270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/97e8237b-dae2-4ee0-93ac-4c04aa01340d.png?resizew=171)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4349207577312a34be8428d01e28d051.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7d4618e1b7e2097912a22bd19b7e9.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图,平面
平面
,四边形
为正方形,点B在正方形
的外部,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/34b18a44-549a-4fe2-905f-fce7e244513f.png?resizew=188)
(1)证明:
.
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9905abb76186af63eb7e9565d796bce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc961d1d9d745f7e69260a86553f956.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/34b18a44-549a-4fe2-905f-fce7e244513f.png?resizew=188)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc0666d63e6c13fa6a19b59523aa1eb.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0bc34d1771fb14c101911660eaa075b.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
为矩形,平面
平面
,
,
,
,
为
的重心,
.
(1)当直线
平面
时,求
的值;
(2)当
时,求平面
与平面
的夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5b19274df22cd2421a4eb2845c6c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2095837b7420f07fc9ae946ece406df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee40d5bb6e8243cb7e9ffafed1b1c9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/57656c54-41bd-4285-bfb0-5c8848ca613e.png?resizew=165)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a227bcc7ee91e914c0c6bec05f82b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5da631296d53a08d56fb5f9bec2376c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b6855ff38858f4c62013c46a0aa3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383ec3453527947ed7a5960e9a8fbe0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在多面体
中,四边形
为菱形,
,
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/85159cd4-8b37-42ff-bd2c-f4a67d548c3d.png?resizew=167)
(1)求证:
;
(2)若
,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15cd53fe7b73365723ce4789bb259d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f5ba965420dfd5aa4da211682df096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/85159cd4-8b37-42ff-bd2c-f4a67d548c3d.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bbadadfde2a02c3e4c16d7b44f6324.png)
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