1 . 如图甲,⊙
的直径
,圆上两点
在直径
的两侧,使
,
.沿直径
折起,使两个半圆所在的平面互相垂直(如图乙),
为
的中点,
为
的中点.
为
上的动点,根据图乙解答下列各题:
![](https://img.xkw.com/dksih/QBM/2015/7/10/1572178130649088/1572178136727552/STEM/a10e8e1796914503b4a7bbc2a37982c3.png)
(1)求点
到平面
的距离;
(2)求证:不论点
在何位置,都有
⊥
;
(3)在
弧上是否存在一点
,使得
∥平面
?若存在,试确定点
的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45bddb90e3606387c047807ee4cec379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefb8568cff65e8ae19e27a2b769017f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2015/7/10/1572178130649088/1572178136727552/STEM/a10e8e1796914503b4a7bbc2a37982c3.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:不论点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
您最近一年使用:0次
2 . 如图,在四棱锥
中,底面ABCD为菱形,
平面ABCD,
,
,E,F分别是BC,PC的中点.
Ⅰ
证明:
;
Ⅱ
设H为线段PD上的动点,若线段EH长的最小值为
,求直线PD与平面AEF所成的角的余弦值.
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182905701556224/2184215223328768/STEM/7e7be49f58314a1bb3ebc2ad9eb45043.png?resizew=172)
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.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/304e9d63e7fdc531f4f7b805b765a1b1.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/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182905701556224/2184215223328768/STEM/7e7be49f58314a1bb3ebc2ad9eb45043.png?resizew=172)
您最近一年使用:0次
2018-03-16更新
|
1600次组卷
|
7卷引用:广东省深圳市第九高级中学2018-2019学年高二上学期期中考试数学试题(理)
3 . 长方体
中,
,
,点
为
中点.
![](https://img.xkw.com/dksih/QBM/2015/7/10/1572178491924480/1572178497781760/STEM/d9abb2855702425a8a8f1d28fd447987.png)
(Ⅰ)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
平面
;
(Ⅱ)求证:
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a53ecb573efb44465fa11b22f9198e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2015/7/10/1572178491924480/1572178497781760/STEM/d9abb2855702425a8a8f1d28fd447987.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb8b9b4d0fded993bf8b618f0820407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
您最近一年使用:0次
4 . 如图,矩形
中,
,
,
在
边上,且
,将
沿
折到
的位置,使得平面
平面
.
(Ⅰ)求证:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348d4333ecdfc3e3b1ba16dc312550d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced76e1ee551955a877688618b1f4ad.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5a101bb92bd721e35acc7023154b44.png)
![](https://img.xkw.com/dksih/QBM/2017/4/18/1668561570709504/1668648730017792/STEM/cd7d6f1167504c9eb741ff615f56b857.png?resizew=149)
您最近一年使用:0次
2017-04-18更新
|
2056次组卷
|
5卷引用:广东省佛山市荣山中学2019-2020学年高二上学期期中数学试题
5 . 如图,在四棱锥
中,侧棱
,底面
为直角梯形,其中
,
.
![](https://img.xkw.com/dksih/QBM/2016/12/26/1619432936792064/1619432937267200/STEM/ba9f9eb5b6cf47068d1f3b21d0264c3d.png)
(1)求证:侧面PAD⊥底面ABCD;
(2)求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05dda88294a484c177b72e87e912952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a6bbe6520691932108489328463e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://img.xkw.com/dksih/QBM/2016/12/26/1619432936792064/1619432937267200/STEM/ba9f9eb5b6cf47068d1f3b21d0264c3d.png)
(1)求证:侧面PAD⊥底面ABCD;
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
您最近一年使用:0次
2016-12-04更新
|
447次组卷
|
3卷引用:2015-2016学年广东汕头市高二下学期期末数学(文)试卷
6 . 如图,直角三角形
中,
,沿斜边
上的高
,将
折起到
的位置,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572970456940544/1572970463264768/STEM/abdf6d23b46e47cf93fac111e4b9c86d.png)
(1)求证:
;
(2)过点
作
交
于点
,点
为
中点,若
平面
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94507394a55f53494bf44d5116f7a198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da95ecece2225aeaa4fd2ea84dc61753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ae08153d099dcdcae16194e2fffc0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572970456940544/1572970463264768/STEM/abdf6d23b46e47cf93fac111e4b9c86d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93fb7b30592e38fb91f5342cd7a71849.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced90ea9183e02e54da78709e3cb9169.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f79db7c270b6ff9fb0a538ee201cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193b5b41994c2a4dfa5bb0bc984061cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7558aa5068ceb3d3a35bf56422418dea.png)
您最近一年使用:0次
7 . 如图,四棱锥
,底面
是
的菱形,侧面
是边长为
的正三角形,且与底面ABCD垂直,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/9ca9a10d50ef4509b235dc52db83ad85.png)
(I)求证:
;
(II)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56fbe4053a65b67949981f24c0d30b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b0c4c783dd55685bd3e88bb31c6696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba122ff4fb6c7f5a107b3ec970ad43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf5cb457a768676c10da10ccfdbb2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9c827e46d1a395fafbf15cdd6c6c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f34602291e9e293ff64a1606e29dc.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/9ca9a10d50ef4509b235dc52db83ad85.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac0e1293aae6c92e1d5d255cb16077f.png)
(II)求直线
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/b254d2dfad62424097e4d69ebfcc3952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fefbe52c070d8831b1d9bc8b1412b67.png)
您最近一年使用:0次
8 . 如图所示,在四棱锥
中,
平面
,又
,
,且
.
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572643202678784/1572643208347648/STEM/f126915e67d24850b4717b1d83fc697d.png)
(1)在网格中画出四棱准
的正视图;
(2)求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
平面
;
(3)在棱
上是否存在一点
,使得
平面
,若存在,求
的值. 若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458f4503e211b542f6f30c8a34eaca5.png)
![](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/63ab4d12ad313f0087c6e32d5118ba28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2152d060ef82e9e60f7288fd2ae3a2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/20/1572643202678784/1572643208347648/STEM/f126915e67d24850b4717b1d83fc697d.png)
(1)在网格中画出四棱准
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4a0d511365abd9df144a412ccd4615.png)
您最近一年使用:0次
名校
9 . 如图,平行四边形ABCD中,CD=1,∠BCD=60°,BD⊥CD,正方形ADEF,且面ADEF⊥面ABCD.
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119128588034048/2121610491600897/STEM/a33173b9adff4f4dabb2785173534f86.png?resizew=152)
(1)求证:BD⊥平面ECD;
(2)求D点到面CEB的距离.
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119128588034048/2121610491600897/STEM/a33173b9adff4f4dabb2785173534f86.png?resizew=152)
(1)求证:BD⊥平面ECD;
(2)求D点到面CEB的距离.
您最近一年使用:0次
2016-12-04更新
|
641次组卷
|
3卷引用:2015-2016学年广东实验中学高二下期中文科数学试卷
10 . 如图,四棱锥
中,底面
为菱形,
底面
,
是
上的一点,
.
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/871f1d9bbcfc427491b659895c6c5846.png)
(1)证明:
平面
;
(2)设二面角
为
,求
与平面
所成角的大小.
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/502d3b6a255b4aef85dc18df45187942.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/bef826df5dab4878bdbd2e5b8bb7b626.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/bd3ae70d350b47f4bc04a546d4863fdc.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/bef826df5dab4878bdbd2e5b8bb7b626.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/e63109cf885443e7be94deb2f11a4cba.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/a159257df8794b37aa7bbaa7298e2e06.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/f6615b1de5ca4d4891c2eb43415ed8f8.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/871f1d9bbcfc427491b659895c6c5846.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/36bc1fe7c29f445faf7b10bf50267501.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/54b88e77cfae4734853c17c848d6b4ad.png)
(2)设二面角
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/707474c2b0e54a9d994cc88d0d1c2ce0.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/7d5e593c0f644fe8bc5cfac0a43407a2.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/615479ca3c2f406a9fec608d571a99e5.png)
![](https://img.xkw.com/dksih/QBM/2017/1/18/1619459264249856/1619459264798720/STEM/e01efd6cd8b74c9e8d95379eb4cc970e.png)
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