名校
1 . 如图1,在矩形
中,
,
,点
在线段
上,
.把
沿
翻折至
的位置,
平面
,连结
,点
在线段
上,
,如图2.
![](https://img.xkw.com/dksih/QBM/2020/3/29/2430142637858816/2430209033289728/STEM/66f958524ab246e29b74cd0c3e3e3c5f.png?resizew=302)
(1)证明:
平面
;
(2)当三棱锥
的体积最大时,求二面角
的余弦值.
![](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/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4bc999f4420b068568bf1df801b87b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66a3ff50fff1cae207ebc89797d6978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b08323318c6ec653017546cb9927800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a7bcc1efb8a2ff57d64b6d057da463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c6b15f2975c451b9acb7d6e97a4124.png)
![](https://img.xkw.com/dksih/QBM/2020/3/29/2430142637858816/2430209033289728/STEM/66f958524ab246e29b74cd0c3e3e3c5f.png?resizew=302)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f70cf3f6c7acbf60d4a4ca0ce89619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503be2b7feae04f09c329dd3cd8ee58c.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c250d1f34704213771afc4caefb7752a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654d9816302adf92a3e83fa1a25731b6.png)
您最近一年使用:0次
2020-03-29更新
|
3243次组卷
|
6卷引用:2020届福建省高三毕业班质量检查测试理科数学
2020届福建省高三毕业班质量检查测试理科数学福建省2019-2020学年高三3月质量检测数学(理)试题黑龙江省哈尔滨市第九中学2020届高三第三次模拟考试数学(理)线下试题黑龙江省哈尔滨九中2020届高三高考数学(理科)三模试题(已下线)考点24 空间几何体体积及表面积(讲解)-2021年高考数学复习一轮复习笔记四川省宜宾市叙州区第一中学校2020-2021学年高三上学期第一次月考数学(理)试题
名校
解题方法
2 . 如图所示1,已知四边形ABCD满足
,
,E是BC的中点.将
沿着AE翻折成
,使平面
平面AECD,F为CD的中点,如图所示2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/adc1e885-c76e-46e8-b307-b585244885d0.png?resizew=298)
(1)求证:
平面
;
(2)求AE到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53642dc703579b9ca9c79a2598b0b022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f38a857b9fabe179c565feb88de4175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c60a0de546f75b46348265746aa707.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/adc1e885-c76e-46e8-b307-b585244885d0.png?resizew=298)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
(2)求AE到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a774f665020331e88f88644e9d40d7.png)
您最近一年使用:0次
2020-03-19更新
|
279次组卷
|
3卷引用:2020届陕西省西安市高新一中高三第五次模拟考试数学(文)试题
解题方法
3 . 如图所示的五面体中,
是正方形,
是等腰梯形,且平面
平面
,
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/5f7325ef-fea7-4210-9ac9-8317e8901ee3.png?resizew=209)
(1)求证:平面
平面
;
(2)
为线段
的中点,
在线段
上,记
,
是线段
上的动点. 当
为何值时,三棱锥
的体积为定值?证明此时二面角
为定值,并求出其余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5747d138808e8ae03858c07dca6f19f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9003d21719232f65698743d8ecf8edd6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/5f7325ef-fea7-4210-9ac9-8317e8901ee3.png?resizew=209)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e92d42e94cb01dabba1db6fc18c66b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7e524de0f5d99fbd82f58d28dd4219.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1d42d8642fcdd53522c07fe7b3db8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cc391036004bfc202e934285ee7fa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63884ba9b24c3729315d0bb8a230d66.png)
您最近一年使用:0次
4 . 如图1所示,在等腰梯形ABCD中,
,
,垂足为E,
,
将
沿EC折起到
的位置,如图2所示,使平面
平面ABCE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/1b8f56dc-424d-4bc5-b108-d8c8ad3b0661.png?resizew=274)
(1)连结BE,证明:
平面
;
(2)在棱
上是否存在点G,使得
平面
,若存在,直接指出点G的位置
不必说明理由
,并求出此时三棱锥
的体积;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a398397362a18da1cc9f24bf3f356ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91041f4cac0f0cfacc749167d4ad62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ba44e8746668d15ff9abb4598f2caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675d7fbe782edce4a585e75a9d78e2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd8168bac8b10cad2ead420a392fdef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/1b8f56dc-424d-4bc5-b108-d8c8ad3b0661.png?resizew=274)
(1)连结BE,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5be9a47ac9a5d72f320a47da97bfbd.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55537f7dbac74c17fe0dc386dcdab3fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb4e4c148b9185e09e454955eaa7312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0371a673ca03e92d996d7b3601ae0ca.png)
您最近一年使用:0次
2020-01-30更新
|
699次组卷
|
6卷引用:2020届重庆西南大学附属中学校高三第五次月考数学(文)试题
5 . 三棱锥
中,
,
,平面
平面
.若三棱锥
的顶点都在球
的球面上,则球
的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018768af201fdf9860650f1eeba0a65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80137ee8af4684ce558242d8b3f1459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
6 . 如图,四边形
是边长为
的正方形,平面
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/2698a95d-01f0-44c3-9e10-3478e11a6344.png?resizew=176)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c766942d554e7f15ffec6eaacbe0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce5d70b14ae05ad1eee6593a6ddfc0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/2698a95d-01f0-44c3-9e10-3478e11a6344.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8511319e215aeba124994a03f2d91fcb.png)
您最近一年使用:0次
2020-11-16更新
|
619次组卷
|
5卷引用:福建省福安市一中2018届上学期高三 期中文科数学试题
名校
解题方法
7 . 如图,在体积为1的三棱柱
中,侧棱
底面ABC,
,
,P为线段AB上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6d31510d-aaf3-4cbd-8114-1860a6d51cac.png?resizew=256)
(1)求证:
;
(2)当AP为何值时,二面角
的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9ce838d7f2790addb9fc0107229525.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6d31510d-aaf3-4cbd-8114-1860a6d51cac.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afc8ea17cfc5030733b299598161a9e.png)
(2)当AP为何值时,二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6198bf1e3ab20ecbd03f46f6e91a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次
名校
解题方法
8 . 三棱锥
中,
,
,
,
,若平面
平面ABC,则三棱锥
外接球的表面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17141cf4231555984acc3b41742fdd11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
您最近一年使用:0次
名校
解题方法
9 . 如图,在长方
中,
,
,E为
的中点,以
为折痕,把
折起到
的位置,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/4e6ed3e7-2b69-49ac-b98a-0cfb5a3f3297.png?resizew=336)
(1)求证:
;
(2)在棱
上是否存在一点P,使得
平面
,若存在,求出点P的位置,若不存在,请说明理由.
![](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/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38efab2b954882d5d6b664b2a8d4c879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e616d2f244adf31a69c1b8779168f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fd4f68511d2393905617bfdeddddec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/4e6ed3e7-2b69-49ac-b98a-0cfb5a3f3297.png?resizew=336)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c75d1b97dc32e2b99bccd4d8a02ef17.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f611f5bb08a66cae8fe411e59a1c08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a4a1b9d7d801ca2e2e8fd9bf5434cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2020-02-23更新
|
664次组卷
|
4卷引用:福建省南平市2019-2020学年高一上学期期末数学试题
福建省南平市2019-2020学年高一上学期期末数学试题福建省永安市第三中学2020-2021学年高二10月月考数学试题(已下线)江西省南昌市进贤二中2019-2020学年高二下学期数学期中考试数学试题山西省寿阳县第一中学2020-2021学年高二上学期第二次月考数学(理)试题
名校
10 . 如图在直角梯形ABCD中,AB//CD,AB⊥BC,AB=3BE=3
,CD=2
,AD=2.将△ADE沿DE折起,使平面ADE⊥平面BCDE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/b2f91889-8618-4ac8-b69f-d75a56c5b910.png?resizew=381)
(1)证明:BC⊥平面ACD;
(2)求直线AE与平面ABC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/b2f91889-8618-4ac8-b69f-d75a56c5b910.png?resizew=381)
(1)证明:BC⊥平面ACD;
(2)求直线AE与平面ABC所成角的正弦值.
您最近一年使用:0次
2020-02-21更新
|
307次组卷
|
2卷引用:河北省邢台市2018-2019学年高二上学期期末数学(理)试题