在四棱锥
中,四边形
为正方形,
是
的中点,在线段
上取一点
,过
和
作一平面与平面
交于
,则直线
与
所成角的大小是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084c7f1889dcb7699888232a64a20be3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-02-15 11:11:45
|
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】在长方体
中,
与平面
所成的角为
与
所成的角为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b77cc3aef2763547eb20c7f0610c65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】如图,在正三棱柱
中,
,
,
分别为
,
的中点,则异面直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/d7a359a6-4294-4b06-8487-2d627ef76f83.png?resizew=119)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c5282bc1ea20767a6c092c22c761ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/d7a359a6-4294-4b06-8487-2d627ef76f83.png?resizew=119)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】在棱长为
的正方体
中,错误的是
![](https://img.xkw.com/dksih/QBM/2013/7/19/1571297481089024/1571297486626816/STEM/350e660c4ae24cb78d1ca1d66704e4e6.png)
![](https://img.xkw.com/dksih/QBM/2013/7/19/1571297481089024/1571297486626816/STEM/5d2a1c8f4ee04194ad74f79b2c002dd5.png)
A.直线![]() ![]() ![]() |
B.直线![]() ![]() |
C.二面角![]() ![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】如图,在正三棱柱
中底面边长、侧棱长都是4,
别是
的中点,则以下四个结论中正确的是( )
①
与
所成的角的余弦值为
;②
平行于平面
;③三棱锥
的体积为
;④
垂直于
.
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502401788166144/2502801922809856/STEM/b586bdcf-c640-4d92-91c3-ae5d4ac4ac23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ea285e96bf2e3b6406151bb694f10a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456175ea34492f0bc025aaab668fa659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f558992e649b93ee36f37513781311a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456175ea34492f0bc025aaab668fa659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92460b66d7bebcff85abac4e24c0eb20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/9/2502401788166144/2502801922809856/STEM/b586bdcf-c640-4d92-91c3-ae5d4ac4ac23.png)
A.①②③ | B.②③④ | C.①③④ | D.①②④ |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】以下说法错误 的是( )
A.已知平面![]() ![]() ![]() ![]() ![]() ![]() |
B.已知直线a、l,平面![]() ![]() ![]() ![]() ![]() ![]() |
C.如果空间中两个角的两条边分别对应平行,则这两个角相等 |
D.用一个平面去截一个正方体,截面图形有可能是等边三角形,不可能是直角三角形 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】已知在正方体
中,
分别是棱
的中点,
是棱
上一点,则下列命题中正确的个数为( )
①异面直线
与
之间的距离为定值;
②平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
平面
;
③设平面
平面
,则
;
④直线
与平面
所成的角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18d8f78500301347c238d8079cb7208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5b5d9bed01632b26ab881deab2afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a253cf6e78c3d60d1d29a24e2f0a41d.png)
③设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6704f9196e4a299664383c683a064c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72063e390276ce5fb902c2a9c4aa8f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04ba55ac2061f4e3da6a9b141593bed.png)
④直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次