名校
1 . 如图,四棱锥P-ABCD的底面是正方形,E为AB的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee92e5d20f0583f559561ec83d32809.png)
(1)证明:
平面PCD.
(2)求DA与平面PCE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee92e5d20f0583f559561ec83d32809.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/17/3b4463a8-09af-4566-9164-bb054be11c5d.png?resizew=135)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
(2)求DA与平面PCE所成角的正弦值.
您最近一年使用:0次
2020-03-24更新
|
745次组卷
|
7卷引用:福建省晋江市磁灶中学2022届高三上学期阶段测试(一)数学试题
名校
2 . 如图,在三棱柱
中,
,点
是
的中点.
(1)求证:
平面
;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c9d5218496a30138b3b04fc27dd0b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8757caaf61dd37db7a297c6c77b8881.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed37556e3524d342bf19c961fde0a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2f7554a52815bfa0f4d75221ba7397.png)
您最近一年使用:0次
2017-03-17更新
|
2129次组卷
|
4卷引用:福建省福州市第一中学2020年高二下学期开学前质检数学试题