如图,PO是四棱锥
的高,且
,底面ABCD是边长为
的正方形,
,点M是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/75d84e5c-2166-4d62-8bc8-fcab43cebaa2.png?resizew=195)
(1)设AD与OM交于E,求线段OE的长度;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5c40f909fae89547423350cd87398d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/75d84e5c-2166-4d62-8bc8-fcab43cebaa2.png?resizew=195)
(1)设AD与OM交于E,求线段OE的长度;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb67654a44ce4e4f10dcd44bbb849dae.png)
更新时间:2023-04-24 22:14:46
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图(1)所示,
,
,
,如图(2)所示,把
沿
折起,使平面
平面
,
为
的中点,连接
,
,
.
(1)求证:平面
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37444a4da006d26dd252bee7c6cecf01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d43bb51f5ac9192f916f29dd70d466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.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/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/1/638cf6a7-7f8f-4f5b-a8e6-a681964179ce.png?resizew=403)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324d453870b345da0c41977290192f94.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,已知
平面
是正三角形,
.
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fde5b9b07b288a63f8202b11a5e7413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f779e7f5f53e4377b9a0a8e945d562.png)
![](https://img.xkw.com/dksih/QBM/2018/10/10/2050723623747584/2052752350191616/STEM/63336e7985914f1db9aa595de0ff4f55.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370148e9147aa25c60a07ab4ad46e83d.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
【推荐1】如图,几何体是圆柱的一部分,它是由矩形ABCD(及其内部)以AB边所在直线为旋转轴旋转120°得到的,G是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/70731313-3a1d-4283-84ba-985f9d64f88c.png?resizew=147)
(1)设P是
上的一点,且AP⊥BE,求∠CBP的大小;
(2)当AB=3,AD=2时,求二面角E-AG-C的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb53e0fdf3ebeb96e4f69feacbd80e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/70731313-3a1d-4283-84ba-985f9d64f88c.png?resizew=147)
(1)设P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8192018a58bb1fe23769a48a4d9042ed.png)
(2)当AB=3,AD=2时,求二面角E-AG-C的大小.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
的三视图中,俯视图为边长为1的正方形,正视图与侧视图均为直角边长等于1的等腰直角三角形,M是SD的中点,
交SC于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b0cecd6b-761c-4e7d-9db8-2d0a23e5fce1.png?resizew=169)
(1)求证:
;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f04e6ed01c8f3778a64f055d33ee70c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b0cecd6b-761c-4e7d-9db8-2d0a23e5fce1.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7690424e1bbb494aac511ed342a6d8.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】在如图所示的多面体中,
,四边形
为矩形,
,
.
![](https://img.xkw.com/dksih/QBM/2022/9/11/3064021239562240/3065827235086336/STEM/6a7ae01d7af44780aade7c2ac948155d.png?resizew=242)
(1)求证:平面
平面
;
(2)设半面
平面
,
,
平面
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbc56d42b003cbcb1fbe5c50e55b26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940078c89bad1724a5d7006a54755398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://img.xkw.com/dksih/QBM/2022/9/11/3064021239562240/3065827235086336/STEM/6a7ae01d7af44780aade7c2ac948155d.png?resizew=242)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85469a248bf54671d1f500b7812ff100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14eec658f69c267a70c1e8f9b744e282.png)
(2)设半面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd788591c314f3b540b4b89ee5cdec8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4b51508bd85c1a47f822c39fbc39b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b755d315e74d8833765f2b1693b78d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】在斜三棱柱
中,
是边长为2的正三角形,侧面
底面
.
;
(2)
为
的中点,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9227c4e4503a97f1d469620a8bd74f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e5dc81fbafbe58bff0842f7776d80a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
您最近一年使用:0次