如图,在四棱锥P-ABCD中,底面ABCD为平行四边形,E为侧棱PA的中点.
(1)求证:PC // 平面BDE;
(2)若PC⊥PA,PD=AD,求证:平面BDE⊥平面PAB.
(1)求证:PC // 平面BDE;
(2)若PC⊥PA,PD=AD,求证:平面BDE⊥平面PAB.
![](https://img.xkw.com/dksih/QBM/2018/6/12/1965789809459200/1968470763716608/STEM/c7277f4514ff496784fc821b18439e25.png?resizew=168)
更新时间:2017-03-15 12:25:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在直三棱柱
中,
分别为
的中点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e38f87fee03ebfff28772837993e00ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0863947c83ce1b420980973a3690802b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae80f09dae8acbe1e5e27bd5c4d8164.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f688d4fe926d5857ef91ac364db411f.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】如图,菱形ABCD的边长为6,∠BAD=60°,AC
BD=O,将菱形ABCD沿对角线AC折起,得到三棱锥
,点M是棱BC的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/514dec2a-8f1c-48b4-8ec4-02e66e69c699.png?resizew=333)
(1)求证:OM
平面ABD;
(2)求证:平面ABC
平面MDO;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66854bb5784c29a27075e884e10e392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ffdaecfb3c73d403179e5745c71a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36552f4ac365373c91949981301a8d8e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/514dec2a-8f1c-48b4-8ec4-02e66e69c699.png?resizew=333)
(1)求证:OM
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(2)求证:平面ABC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a32d8ffd4da1884ab01cb7a077418a8.png)
您最近一年使用:0次
【推荐1】如图,D为圆锥的顶点,O是圆锥底面的圆心,AE为底面直径,
.△
是底面的内接正三角形,P为DO上一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/ffb74dfa-4c10-4607-b3a4-4e37c5cd3208.png?resizew=164)
(1)证明:平面
平面PBC;
(2)求E到平面PBC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3198a3e5c9200a3c6811fae4afa67b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e8472f8ceb1721ba449151e5aa2c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/15/ffb74dfa-4c10-4607-b3a4-4e37c5cd3208.png?resizew=164)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
(2)求E到平面PBC的距离.
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
中,底面
为正方形,
底面
,
,
为线段
的中点,
为线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2022/5/19/2983014030344192/2984836545757184/STEM/ff70c3d1-5a4e-4892-a7cd-e764e6f4e3f8.png?resizew=176)
(1)求证:平面
平面
;
(2)若
为线段
上靠近
的三等分点,求二面角
的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2983014030344192/2984836545757184/STEM/ff70c3d1-5a4e-4892-a7cd-e764e6f4e3f8.png?resizew=176)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5f8dfb22b415219ba7af3dc7e3d808.png)
您最近一年使用:0次