已知等边
的边长为4,
是
边上的高,E,F分别是
和
边的中点,现将
沿
翻折成直二面角
.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949482463895552/2955229042335744/STEM/ef6ee14c-7efe-4c71-a75c-8f52b0f1e595.png?resizew=325)
(1)求直线
与平面
的夹角的正弦值;
(2)在线段
上是否存在一点
,使
?证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6dfb039aafe2d2841f8c28b117cf741.png)
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949482463895552/2955229042335744/STEM/ef6ee14c-7efe-4c71-a75c-8f52b0f1e595.png?resizew=325)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e32cf73c01995c91c3523fa11b3bd7d.png)
更新时间:2022-04-10 16:51:47
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在三棱柱ABC-A1B1C1中,侧面AA1C1C是矩形,平面ABC⊥平面AA1C1C,AB=2,AC=1,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/61ca7863-c262-4f4e-b188-3da672b6cbdc.png?resizew=152)
(1)求证:AA1⊥平面ABC;
(2)在线段BC1上是否存在一点D,使得AD⊥A1B?若存在求出
的值,若不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949723daa7c482a9cd202eb37b20689d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9ea9c6af46c388ca27c4bc7ec66963.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/61ca7863-c262-4f4e-b188-3da672b6cbdc.png?resizew=152)
(1)求证:AA1⊥平面ABC;
(2)在线段BC1上是否存在一点D,使得AD⊥A1B?若存在求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0be4183ae211449c41a9473254ac56.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四棱锥
的底面
是平行四边形,
,
,
,
面
,设
为
中点,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445102108672/STEM/63d6792103284515894840d2e33b38a1.png?resizew=323)
(1)求证:
平面
;
(2)设异面直线
与
的夹角为
,若
,求
的长.
![](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/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3c11de81d6b7d9cb6b34f67aba11fb.png)
![](https://img.xkw.com/dksih/QBM/2017/1/6/1619445101486080/1619445102108672/STEM/63d6792103284515894840d2e33b38a1.png?resizew=323)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4734735213b599a9915e1ed91a5d8ce4.png)
(2)设异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75fc81977aee721525b4c5625f5a097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d4de4a61d36da20d9bad79db1d5400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8169f84b684b1744157c7390580964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】平行四边形
所在的平面与直角梯形
所在的平面垂直,
∥
,
,且
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f73fb027-67be-4fc6-b323-099df245b5eb.png?resizew=170)
(1)求证:
;
(2)求点
到平面
的距离;
(3)若直线
上存在点
,使得直线
所成角的余弦值为
,求直线
与平面
成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cd928cc17dec710a5d38928eb9493d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ce8821cc2f3253b9ae9ed7c74b0d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f73fb027-67be-4fc6-b323-099df245b5eb.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(3)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255e4b31260bb48247bb50ff55b1418b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图(1),在
中,
,
,
.
,
分别是
,
上的点,且
,
,将
沿
折起到
的位置,使
,如图(2).
![](https://img.xkw.com/dksih/QBM/2018/7/16/1989942535307264/1990977815969792/STEM/5030e989-d721-439a-bbac-caef599054fe.png?resizew=386)
(1)求证:
平面
;
(2)若
是
的中点,求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c03f13bba5fed0f0302c0b726b2041a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2fef4031c10abc18c8747af6b9a8a.png)
![](https://img.xkw.com/dksih/QBM/2018/7/16/1989942535307264/1990977815969792/STEM/5030e989-d721-439a-bbac-caef599054fe.png?resizew=386)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在正三棱柱
中,
分别为
的中点,
.
(1)求
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9ad711b25c36dae0c2a2cedff9954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5307e04a84a0621e4d5bd2aaa1980ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c900469aa49ade44b53319b03fc4354.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/6d91fcf1-2dae-4f97-9d86-3243460e637a.jpg?resizew=111)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
您最近一年使用:0次