名校
1 . 在四棱锥P-ABCD,底面ABCD为菱形,
E为线段BC的中点.
(1)证明:平面
平面
;
(2)已知
,且二面角A-BD-P的大小为
,求AD与平面BDP所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7934bcd133eeeff55484d1f695523ea.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9303b41310b6bf2a5fe9b66dfcd7fcb5.png)
您最近一年使用:0次
10-11高二下·四川成都·阶段练习
2 . 如图,四棱锥P﹣ABCD的底面是边长为
的菱形,∠BCD=120°,PC⊥平面ABCD,PC=
,E为PA的中点,O为底面对角线的交点;
![](https://img.xkw.com/dksih/QBM/2011/4/2/1570103484932096/1570103490142208/STEM/ac6544d6196141cf81de7fe54081fe69.png?resizew=215)
(1)求证:平面EDB⊥平面ABCD;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2011/4/2/1570103484932096/1570103490142208/STEM/ac6544d6196141cf81de7fe54081fe69.png?resizew=215)
(1)求证:平面EDB⊥平面ABCD;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af818319be607187e4c0ee637e9e024a.png)
您最近一年使用:0次