1 . 已知四棱锥
,底面
是菱形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/2/6/2652049351852032/2652908411052032/STEM/6d197fdf9db147228ac1017a3da9c3f8.png?resizew=271)
(1)证明:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf80b036459da6dcb841a4bbe3859fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2686149cd09003b9dcccb51d81fe51ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed66431681da1db8f7cb0f40cd19201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af62a8c94bdc27efa2ec03e58d9400ae.png)
![](https://img.xkw.com/dksih/QBM/2021/2/6/2652049351852032/2652908411052032/STEM/6d197fdf9db147228ac1017a3da9c3f8.png?resizew=271)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
2021-02-07更新
|
658次组卷
|
3卷引用:西藏昌都市第一高级中学2022届高三下学期入学考试数学试题
19-20高一·浙江·期末
2 . 如图,在棱长为2的正方体
中,
分别是
的中点,则直线
到平面
的距离为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6aa6418107993126a791cc41c12e9b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6609003c487e839f218f86f239deaf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629765649932288/2629804887588864/STEM/e62148d8-fbcd-4cf0-8e88-2a2d07a1cab0.png)
您最近一年使用:0次
2021-01-05更新
|
436次组卷
|
3卷引用:西藏昌都市第一高级中学2022届高三下学期入学考试数学试题