解题方法
1 . 如图,在Rt△ABC中,
,D是斜边AB的中点,将△BCD沿直线CD翻折,使得二面角B﹣CD﹣A为直二面角,则此时线段AB的长度为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f151f67b6caf66769b1e25e7f102b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/17443cc8-a447-4423-8770-dfbde89113f2.png?resizew=272)
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名校
2 . 如图,在平行四边形ABCD中,
,四边形ACEF为正方形,且平面
平面ACEF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dbae6f82-443c-46fa-9876-b870458f380b.png?resizew=185)
(1)证明:
;
(2)求平面BEF与平面BCF所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a64e473873047e3df9b53a2493b6cd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/dbae6f82-443c-46fa-9876-b870458f380b.png?resizew=185)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f76925ed99b7172956319974258a9b.png)
(2)求平面BEF与平面BCF所成锐二面角的余弦值.
您最近一年使用:0次
2020-02-10更新
|
405次组卷
|
2卷引用:2020届山东省济宁市高三上学期期末数学试题
名校
3 . 在等腰梯形
中,
,
,
,
,将梯形
沿着
翻折至
(如图),使得平面
与平面
垂直.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/1620c8aa-b58a-4d02-a686-095bdeba9860.png?resizew=314)
(1)求
与
所成的角的大小;
(2)求二面角
大小的正弦值.
![](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/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/1620c8aa-b58a-4d02-a686-095bdeba9860.png?resizew=314)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a5b0a6f7156f8f7611d109eda87a87.png)
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2020-02-05更新
|
492次组卷
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3卷引用:四川省自贡市2019-2020学年高二年级上学期期末理科数学试题
4 . 如图1,在矩形
中,
,
,点
、
分别在线段
、
上,且
,
,现将
沿
折到
的位置,连结
,
,如图2
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/82b89047-3d30-4fa6-baa3-20812b37635e.png?resizew=395)
(1)证明:
;
(2)记平面
与平面
的交线为
.若二面角
为
,求
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/135fa1bcd82d561853be958e71a2b49b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2908a3e03f724d93ada9dce67ae4cf61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f76d25a7ee16dddad3d183729339ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccbf98ff1b1f121ee3aa3dec108ba0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f29ade460195fcc283d47f8279001d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb903f2919710c2670ee9b1d75395ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af5d32106d31f3e82f47f579f71b492.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/82b89047-3d30-4fa6-baa3-20812b37635e.png?resizew=395)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7d7033e38b9a95462464f5ad0a8618.png)
(2)记平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04f56d6ddb60d555389071fdd50f7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0184a58b0d6d3bbd43fe36f068d8449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641132c85ed2da7f8df8947acf951cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f785147690f83dcee0a0bc6c327e75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d4a002bd4f6aee8635ef448343670d.png)
您最近一年使用:0次
2020高三·江苏·专题练习
5 . 如图,在长方形ABCD中,AB=2,BC=1,E为DC的中点,F为线段EC上(端点除外)一动点,现将△AFD沿AF折起,使平面ABD⊥平面ABCF.在平面ABD内过点D作DK⊥AB,K为垂足,设AK=t,则t的取值范围是( )
![](https://img.xkw.com/dksih/QBM/2020/1/21/2382045599326208/2383311929253888/STEM/47eb12d51dc2443da2563ea01bdafa53.png?resizew=292)
![](https://img.xkw.com/dksih/QBM/2020/1/21/2382045599326208/2383311929253888/STEM/47eb12d51dc2443da2563ea01bdafa53.png?resizew=292)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 如图所示的几何体中,
,
为全等的正三角形,且平面
平面
,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458330821533696/2458772086759424/STEM/358be7d8bd5748ab92a0e7927f3ee00c.png?resizew=189)
证明:
;
求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ff58f671a287701011a1b31e67e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14172212b7b34eaf967c5a72233621c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a566b100fb2ebe3d208f9b6527934218.png)
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458330821533696/2458772086759424/STEM/358be7d8bd5748ab92a0e7927f3ee00c.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe7eaf967808dad0a184eeedfa27721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
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2020高二·浙江·专题练习
名校
7 . 如图,等腰三角形
中,
,
,
,且
平面
,若
则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d7bd6df0e94731edb8f4649903de73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84be64d28b1623e71ad989f37336b1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/952cee815a255c1cb7b5fcde6b032cd6.png)
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2020-01-05更新
|
740次组卷
|
5卷引用:【新东方】杭州高二数学试卷239_240
(已下线)【新东方】杭州高二数学试卷239_240浙江省杭州地区(含周边)重点中学2019-2020学年高二上学期期中数学试题安徽省亳州市涡阳第—中学2020-2021学年高一下学期期末数学试题河南省信阳市信阳高级中学2022-2023学年高一下学期期末数学试题(已下线)【高一模块一】难度7 小题强化限时晋级练 (较难1)
名校
8 . 如图,在四棱锥
中,
平面
,
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/0bc88a90-4ece-4358-97ae-49afc15ff29d.png?resizew=167)
(1)求证:
;
(2)在线段
上,是否存在一点
,使得二面角
的大小为45°,如果存在,求
与平面
所成角的正弦值,如果不存在,请说明理由.
![](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/a6c71a6b019ac056efe40ecbdd05424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab25af2ef12331d8b822c6f0a3844d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/0bc88a90-4ece-4358-97ae-49afc15ff29d.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698335f4880c7a298f4898c83b6562bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
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2020-04-28更新
|
724次组卷
|
2卷引用:湖北省重点高中联考协作体2019-2020学年高二上学期期中数学试题(A卷)
名校
9 . 如图,在四棱锥
中,底面
是矩形,
,
,
底面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4543f909-17d5-427c-ba92-0b1894219849.png?resizew=151)
(1)当
为何值时,
平面
?证明你的结论;
(2)若在
边上至少存在一点
,使
,求
的取值范围.
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/4543f909-17d5-427c-ba92-0b1894219849.png?resizew=151)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83abffb64a927cf133022dd88358e7a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2020-01-03更新
|
1685次组卷
|
6卷引用:四川省南充市高中2019-2020学年高三第一次高考适应性考试数学(文)试题
四川省南充市高中2019-2020学年高三第一次高考适应性考试数学(文)试题(已下线)专题4.5 立体几何中探索性问题-玩转压轴题,进军满分之2021高考数学选择题填空题(已下线)专题31 直线、平面垂直的判定与性质-1陕西省西安市铁一中学2022-2023学年高二上学期1月期末数学试题2023版 湘教版(2019) 必修第二册 过关斩将 第4章 专题强化练6 空间中的垂直关系(已下线)10.3 直线与平面间的位置关系(第2课时)(七大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020必修第三册)
解题方法
10 . 如图,在四棱锥
中,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/3dea8f1f-4c82-4086-b4ff-a863291ae341.png?resizew=141)
(1)证明:
;
(2)设点M在线段PC上,且
,若
的面积为
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6494b48a48aaffbb14f894815f88594a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35da9f7aa257598d2b988085343e045.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/3dea8f1f-4c82-4086-b4ff-a863291ae341.png?resizew=141)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371853a703a8dafa6f8e942f46cb8706.png)
(2)设点M在线段PC上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc47768bee81ee0c6fbc41e3fdeb22cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4f367d0bd5a4563ec594474b8a59ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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