名校
1 . 如图,已知四棱锥
的底面为直角梯形,
为直角,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6455ed204853f0db2d0cbe980361245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a88dc7dc9cd668a57138e1ec71ea2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad2563f18f321e5fcf4a9f5ba1fd26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290a37874cd284fb1a8c864769ce50c9.png)
您最近一年使用:0次
2020-02-01更新
|
600次组卷
|
4卷引用:2020年陕西省高三教学质量检测卷(一)数学理科试题
2020年陕西省高三教学质量检测卷(一)数学理科试题(已下线)2020届超级全能生高考全国卷24省1月联考甲卷数学(理科)试题(已下线)专题04 立体几何-2020年高三数学(理)3-4月模拟试题汇编四川省泸县第二中学2020-2021学年高二上学期第二次月考数学(理)试题
名校
2 . 如果一个四面体的三个面是直角三角形,则其第四个面不可能是( )
A.直角三角形 | B.等边三角形 | C.等腰直角三角形 | D.钝角三角形 |
您最近一年使用:0次
2020-01-31更新
|
176次组卷
|
5卷引用:2017届上海市七宝中学高三下学期综合测试五(5月)数学试题
2017届上海市七宝中学高三下学期综合测试五(5月)数学试题山西省太原市第五中学2020-2021学年高二上学期10月月考数学(文)试题山西省太原市第五中学2020-2021学年高二上学期10月月考数学(理)试题(已下线)第30练 空间点、线、面的位置关系-2021年高考数学(理)一轮复习小题必刷(已下线)课时41 空间直线与平面的位置关系-2022年高考数学一轮复习小题多维练(上海专用)
3 . 如图,长方体
中,
是棱
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/720a0087-4b7d-4380-a930-6ed9e3070626.png?resizew=221)
(Ⅰ)求证:
;
(Ⅱ)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7863ef41313423eb2247c0f9e5ad0f54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/720a0087-4b7d-4380-a930-6ed9e3070626.png?resizew=221)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2394fd037ad92ebc1397c0356e39dff4.png)
(Ⅱ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a5728f3b5606492f22f65f5b9110c4.png)
您最近一年使用:0次
2020-01-30更新
|
903次组卷
|
2卷引用:2020届陕西省咸阳市高三上学期期末考试数学(文)试题
名校
4 . 如图,四棱锥
中,底面
为矩形,侧面
底面
,
,
,
,
与平面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/b91c0c9b-132d-421a-bd5b-ab9cc160687b.png?resizew=161)
(1)证明:
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/b91c0c9b-132d-421a-bd5b-ab9cc160687b.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0f73cf7ab0c2a8a0099cb2873c81f4.png)
您最近一年使用:0次
名校
5 . 如图,在三棱柱ABC-A1B1C1中,
,
,
面
,
是线段
上的动点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/08f37b67-158a-4e6c-9141-41c33672611d.png?resizew=128)
(1)证明:
;
(2)若
且直线
与
所成的角是
,求出
的长,并求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585045d5efe79912edc19823dfa80d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/08f37b67-158a-4e6c-9141-41c33672611d.png?resizew=128)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b090058790a8cfcdda6c697d5e9c99e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4cae354e7c18c7c8b1bae7d53bd06b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e516121599c9fcc528121c00afcf52fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c39d0d1cbb21e6812acfd0de2aaa87.png)
您最近一年使用:0次
2020-01-14更新
|
292次组卷
|
2卷引用:宁夏银川一中2019-2020学年高一上学期期末数学试题
6 . 某四棱锥的三视图如图所示,则该四棱锥的四个侧面中,直角三角形有__________ 个
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/a086c9d8-0637-4a86-933a-caa5f96ab277.png?resizew=219)
您最近一年使用:0次
名校
7 . 如图,已知四棱锥
,底面
为菱形,
平面
,
,E,F分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374802845057024/2375402125959168/STEM/05619d2539f849449b263256451ae155.png?resizew=240)
(1)求证:
;
(2)若直线
与平面
所成角的余弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b796adcb2d1aed8bb1dcefefe0fec3.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374802845057024/2375402125959168/STEM/05619d2539f849449b263256451ae155.png?resizew=240)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304e9d63e7fdc531f4f7b805b765a1b1.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6265f5256804ccaff618cf8c0675eb8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40df8e474334faad849abb7cc6bbd12c.png)
您最近一年使用:0次
8 . 如图(1),边长为
的正方形
中,
,
分别为
、
上的点,且
,现沿
把
剪切、拼接成如图(2)的图形,再将
,
,
沿
,
,
折起,使
、
、
三点重合于点
,如图(3).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/6036a81c-da8b-48be-9c6e-687c673771bf.png?resizew=378)
(1)求证:
;
(2)求二面角
最小时的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0a24ab1d027cb14725a6a758a6c785.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1a2dbe2665ec6a0fadff8e19da12f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/6036a81c-da8b-48be-9c6e-687c673771bf.png?resizew=378)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb93407a3b472affa1748a1db672e2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe90997c0a36e47450b5cbaea013781.png)
您最近一年使用:0次
2020-01-11更新
|
472次组卷
|
3卷引用:山东省德州市2019-2020学年高三上学期期末数学试题
山东省德州市2019-2020学年高三上学期期末数学试题(已下线)专题24 盘点立体几何中折叠问题——备战2022年高考数学二轮复习常考点专题突破江苏省连云港市灌南高级中学2022-2023学年高二下学期第一次月考数学试题
名校
9 . 如图,在三棱锥
中,平面
平面
,
和
均是等腰直角三角形,
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
;
(Ⅲ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11477bf45c2ad9d554d8f2dbacb5bb67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6677a7d5693deb7e41ed70ecca68f7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2513bfc5f4c4cbc7c07725b9d59bda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99116c812715c5e15ee73d088da4c253.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
2020-01-10更新
|
1034次组卷
|
6卷引用:北京市海淀区2019-2020学年高三上学期期末数学试题
2020高三·浙江·专题练习
10 . 如图,在三棱锥
中,
为等边三角形,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/0e4b05c1-9b0b-467b-ae26-0df311c9c19c.png?resizew=175)
(1)求证:
;
(2)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a21c3a3e71fbec8a46dc6af92655fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d054bdeb762f5b5ebf4d778fc8eed4ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/0e4b05c1-9b0b-467b-ae26-0df311c9c19c.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c177e06cc3f703e8ca7be7c491fa2942.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
您最近一年使用:0次