如图,三棱锥
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/6f218124-45bc-4344-8ec7-35b35e1b2539.png?resizew=127)
(1)求证:
;
(2)是否存在点Q,满足
,且点Q到平面
的距离为1?若存在,求直线
与平面
所成角的正弦值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e938896130979d168332b9f7b3f91ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd88acaf36eb1db328fef1ee6172b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/6f218124-45bc-4344-8ec7-35b35e1b2539.png?resizew=127)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
(2)是否存在点Q,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e5564df71b7f5c72b0e14dfaa45abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
更新时间:2023-11-02 14:13:57
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在四棱锥
中,等边三角形PAD所在的平面与正方形ABCD所在的平面互相垂直,O为AD的中点,E为DC的中点,且
.
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648571756912640/2651466019438592/STEM/d17505d840ed47e1b37add8942f4e808.png?resizew=265)
(1)求证:
平面ABCD;
(2)求二面角
的平面角的余弦值;
(3)在线段AB上是否存在点M,使直线PM与
所在平面成
角?若存在,求出AM的长,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648571756912640/2651466019438592/STEM/d17505d840ed47e1b37add8942f4e808.png?resizew=265)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64cc21c59d53ab1deec410b631c0fec0.png)
(3)在线段AB上是否存在点M,使直线PM与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】如图,圆台下底面圆
的直径为
,
是圆
上异于
的点,且
,
为上底面圆
的一条直径,
是边长为
的等边三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/43c70911-461d-4ee5-840c-c5cbd8b8d30a.png?resizew=166)
(1)证明:
平面
;
(2)求平面
和平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4020513c097ba34df4b42e297f892cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40c49d6e2fc6fbdc21ff61841b586a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8511eeface9029eeaeaf60ec2c722d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/43c70911-461d-4ee5-840c-c5cbd8b8d30a.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c4389148ddf7b7f524439fe0739a71.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】如图,在三棱锥
中,
是以
为斜边的等腰直角三角形,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1012ef33b40b478489204cda41025c.png)
为
中点,
平面
为
内的动点(含边界).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/79354bc6-66da-4e9e-b3b9-f408f9a40033.png?resizew=159)
(1)求平面
与平面
夹角的正弦值;
(2)若
平面
,求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.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/5a1012ef33b40b478489204cda41025c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda3ac680bfea5781ae87dc6db5c5d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d742e749b1140b21512408d555f14a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/79354bc6-66da-4e9e-b3b9-f408f9a40033.png?resizew=159)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc4326d832adea0655b05083e6af7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐2】如图,在直三棱柱
中,
,
,D为
的中点,G为
的中点,E为
的中点,
,点P为线段
上的动点(不包括线段
的端点).
平面CFG,请确定点P的位置;
(2)求直线CP与平面CFG所成角的正弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29ef5a1361ddf48f47a1f8fdb6c08e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecad355286188fd317939fa50f9555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/737d5c0d51f16c43875e0a65557ac375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38413d086b38c176ed8c5b882d17641.png)
(2)求直线CP与平面CFG所成角的正弦值的最大值.
您最近一年使用:0次