名校
解题方法
1 . 如图,在三棱锥
中,
是边长为1的等边三角形,
,
,
,
分别在棱
,
,
上,平面
平面
,若
,则三棱锥
的外接球被平面
所截的图形的周长是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d8c178cdca0d09beb911099dd27dda.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d270ab5dbc5f961d1e0b72c77a0be609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fcce7993f3c222f7c46a0b5ed6d317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52173c8cc44246823c2bee21a783b731.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/5ac29ef6-9d85-4f5e-8936-6e65d1d8cfc9.png?resizew=155)
您最近一年使用:0次
2 . 如图,在正四棱锥
中,
,点
,
分别是
,
上靠近点
的三等分点,点
,
分别是
,
的中点,
,
分别在
,
上,且
,
,若在平面
内存在一点
,使得
平面
,
成立,则
( )
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895559733248/2723952361947136/STEM/22b0ef1616ea442cb04bdbb93d70e027.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91708c4508371f08556e76e31c7cb9ea.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8bc96362590aef2a371444a86866d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea88b6a55b0b78954bed09a05da4038a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b415e29be8abac18f80ac53f6b2027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ca522400972af6fbdc7d5d5d28567c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6798f3d40367c8cf62c12bec8c680899.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895559733248/2723952361947136/STEM/22b0ef1616ea442cb04bdbb93d70e027.png?resizew=180)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 已知正方体
的棱长为3. 点
是棱
的中点,点
是棱
上靠近点
的三等分点. 动点
在正方形
(包含边界)内运动, 且
面
,则动点
所形成的轨迹的长度为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6d286cf61a7540db5cb4068946b098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7bcd16691fdd6c2f280ed20a72f2cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98713e074dc69d81d9e5a1bda31461cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
2020-03-13更新
|
561次组卷
|
3卷引用:2020届福建省厦门市高三毕业班第一次质量检测数学(理)模拟试题
2020届福建省厦门市高三毕业班第一次质量检测数学(理)模拟试题2020届福建省漳州市高三下学期(线上)适应性测试数学(理)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
4 . 在空间中,
是三条不同的直线,
,
是两个不同的平面,则下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
2020-09-24更新
|
495次组卷
|
4卷引用:2020届山西省高三高考考前适应性测试(二)数学(理)试题
2020届山西省高三高考考前适应性测试(二)数学(理)试题2020届山西省高三高考考前适应性测试(二)数学(文)试题(已下线)必刷卷02-2021年高考数学(理)考前信息必刷卷(新课标卷)(已下线)必刷卷04-2021年高考数学(文)考前信息必刷卷(新课标卷)
5 . 如图,四棱锥P-ABCD中,底面ABCD是边长为3的菱形,∠ABC=60°.PA⊥面ABCD,且PA=3.F在棱PA上,且AF=1,E在棱PD上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a282518e-0061-4d88-ad90-44a90f7c71bb.png?resizew=180)
(Ⅰ)若CE∥面BDF,求PE:ED的值;
(Ⅱ)求二面角B-DF-A的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a282518e-0061-4d88-ad90-44a90f7c71bb.png?resizew=180)
(Ⅰ)若CE∥面BDF,求PE:ED的值;
(Ⅱ)求二面角B-DF-A的大小.
您最近一年使用:0次
2021·全国·模拟预测
6 . 在长方体
中,已知
,
,
.若平面
平面
,且与四面体
的每个面都相交,则平面
截四面体
所得截面面积的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462b1c65b1b233ab98a90c164c0968c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414844edd458857bdfc80bffa61cbf9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ac02c2f91cadb1e328bc6ab9b9c491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ac02c2f91cadb1e328bc6ab9b9c491.png)
您最近一年使用:0次
7 . 如图所示,在直角梯形BCEF中,
,A,D分别是BF,CE上的点,
,且
(如图①)将四边形ADEF沿AD折起,连接BE,BF,CE(如图②),有折起的过程中,下列说法中错误的个数是( )
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585106731393024/2585156922671104/STEM/7e57f735-cff3-49c9-bae0-b91647ccb996.png?resizew=383)
①
平面BEF;②B,C,E,F四点不可能共面;③若
,则平面
平面ABCD;④平面BCE与平面BEF可能垂直.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb18f3937480ab5ad6cf0d65a357c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f2275cfc3cc50b92b16288db72cfe0.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585106731393024/2585156922671104/STEM/7e57f735-cff3-49c9-bae0-b91647ccb996.png?resizew=383)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81fa367ec317fe2a30142e1c30cce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1be2a5bfe8bab50cb68fe52d0f92ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2020-11-03更新
|
381次组卷
|
3卷引用:陕西省西安中学2021届高三高考数学(理)模拟试题(三)
8 . 如图,在正四棱柱
中,
,
,过顶点
,
的平面与棱
,
分别交于
,
两点(不在棱的端点处).
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228850681954304/2229037032235008/STEM/450487ee-fdf1-4423-8ef1-4deed64cd444.png)
(1)求证:四边形
是平行四边形;
(2)求证:
与
不垂直;
(3)若平面
与棱
所在直线交于点
,当四边形
为菱形时,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228850681954304/2229037032235008/STEM/450487ee-fdf1-4423-8ef1-4deed64cd444.png)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f844b9dcff4e95ff8b2ab356e58e83f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f844b9dcff4e95ff8b2ab356e58e83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f844b9dcff4e95ff8b2ab356e58e83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
您最近一年使用:0次
名校
解题方法
9 . 三棱柱
中,
,
,
分别为棱
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/c750588e-e11f-46bc-b442-8679481a8071.png?resizew=201)
(1)求证:直线
平面
;
(2)若三棱柱
的体积为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/c750588e-e11f-46bc-b442-8679481a8071.png?resizew=201)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31cdd2441165a1e214037364047bc4dd.png)
(2)若三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e4123975f257306440158659634c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4dd23b3f18e8706463e77bd708dd18.png)
您最近一年使用:0次
2018-04-14更新
|
1002次组卷
|
3卷引用:重庆市2018届高三4月调研测试(二诊)数学(文科)试题