如图,在三棱柱中,侧面
是矩形,
,
,
,且
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/fc5812d0-79a6-477a-bea9-a91a591417f8.png?resizew=149)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
(2)设D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
更新时间:2017-02-08 10:11:01
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相似题推荐
解答题-证明题
|
较难
(0.4)
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【推荐1】如图,在直三棱柱
中,D为AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/f48e38ba-ceb3-4bb8-bccc-fcb8bcc14344.png?resizew=200)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea75a8cbc66e1212b45971c7d09dfe5e.png)
(2)若
,求
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/f48e38ba-ceb3-4bb8-bccc-fcb8bcc14344.png?resizew=200)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea75a8cbc66e1212b45971c7d09dfe5e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f860282bfdb69363c5424a1cff86b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670fb819d2e38750fc44a8ad82e37828.png)
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【推荐2】如图,已知四棱台
的上、下底面分别是边长为2和4的正方形,平面
⊥平面ABCD,
,点P是棱
的中点,点Q在棱BC上.
,证明:
平面
;
(2)若二面角
的正弦值为
,求BQ的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b90595662af9a1936e1e703462cb69b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc862687ca2b31b20dd37eb5375cae6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b1a378a3a4660eb1ece52085a9b44d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d8c5362138fde892955c34074ac5d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4508b5e21a3e74ea980c5b0b691cf689.png)
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解答题-问答题
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解题方法
【推荐1】在①
平面
,②平面
平面
,③
这三个条件中任选一个,补充在下面的问题中,并解决该问题.
问题:如图,在三棱锥
中,平面
平面
,
是以
为斜边的等腰直角三角形,
,
,
为
中点,
为
内的动点(含边界).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/4d4dbf45-e3cd-4bdd-9c4e-615ba50551b3.png?resizew=135)
(1)求点
到平面
的距离;
(2)若__________,求直线
与平面
所成角的正弦值的取值范围.
注:若选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a0a858194b17ae1e609ed341d75194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3ac52a68918388a9148cad6f47454d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df7e34df42220e8ebb5463b1d0bae89.png)
问题:如图,在三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747b3c0eb656c2a9f69c93fbd77d4db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/4d4dbf45-e3cd-4bdd-9c4e-615ba50551b3.png?resizew=135)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若__________,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
注:若选择多个条件分别解答,按第一个解答计分.
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【推荐2】如图,四棱锥
的底面为直角梯形,
底面
,
,
,
,
为棱
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/f839e46d-049a-4386-8a2c-ffbdca73e021.png?resizew=144)
(1)证明:平面
平面
;
(2)若
,求点
到平面
的距离.
![](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/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f26230010388f3bfe15dcd69438c53e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/f839e46d-049a-4386-8a2c-ffbdca73e021.png?resizew=144)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e106f4233be16e98f2c1bf9f1635622.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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【推荐1】如图,在四棱柱
中,已知平面
平面
且
,
.
(1)求证:![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/803f3c0a35d94c30b248d354f7dd4f5e.png)
(2)若
为棱
上的一点,且
平面
,求线段
的长度
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/0079362917514355b29af6cf9e0eaa31.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/07fbc32583ee4842ad676345edb83094.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/3cf0015cb45048429b83716cec28af1d.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/de109c2ecd8340f197d5281f1030ff6d.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/25357c74accd4ef5a6f8cfa19b5ddce3.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/803f3c0a35d94c30b248d354f7dd4f5e.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/aa99112e884d44ae870cf54b39d5b686.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/a4f89aa066284960800922604321823a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/aab602bc4ea74d70955e8f8f28badf8a.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/f6f9b74af90841efae8400bd26a0fd84.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/d0795927eed6445aae424975d85643fb.png)
![](https://img.xkw.com/dksih/QBM/2014/6/24/1571794664857600/1571794670665728/STEM/1d9c645d9c5a4fc180c7c78939478e4d.png)
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(0.4)
名校
解题方法
【推荐2】如图,
为圆锥的顶点,
是圆锥底面的圆心,
为底面直径,
为底面圆
的内接正三角形,且边长为
,点
在母线
上,且
,
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
平面
;
(2)求证:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(3)若点
为线段
上的动点.当直线
与平面
所成角的正弦值最大时,求此时点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/ac14ceee-7a3f-4d58-ad42-39c84439069b.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f5ba965420dfd5aa4da211682df096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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