如图,在平面四边形
中,
,
,将
沿着
翻折,使得点
翻折到点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/180c357f-dadf-4ea2-9529-8d7192f10223.png?resizew=371)
(1)证明:
.
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55340588bd240bc8bbe484f3037fd71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aded98ab04075fff4137ba759bea793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1b638760d907efe836500581da1596.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/180c357f-dadf-4ea2-9529-8d7192f10223.png?resizew=371)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
更新时间:2022-05-26 14:43:43
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在三棱柱
中,侧面
是边长为
的正方形,
为矩形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/51c6946c-8df2-4aed-b56f-f0f204c9e6f7.png?resizew=139)
(1)求证:
平面ABC;
(2)求平面
与平面
所成角的正弦值;
(3)求点C到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9fb806bf3862d351dc4e4ffa3a2283.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/51c6946c-8df2-4aed-b56f-f0f204c9e6f7.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2f7554a52815bfa0f4d75221ba7397.png)
(3)求点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2f7554a52815bfa0f4d75221ba7397.png)
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】正三棱柱
中,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/264ab817-bc7f-4ce8-b36d-769e2a70f350.png?resizew=146)
(Ⅰ)求证:
平面
;
(Ⅱ)设
,
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/264ab817-bc7f-4ce8-b36d-769e2a70f350.png?resizew=146)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db57eca2a7cbd91bc57372592580a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,
,
,
平面ABCD,
,M为PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/a60e0c8d-4932-49d7-be2b-aeee35e06efc.png?resizew=185)
(1)求证:
平面PAD;
(2)设点N在平面PAD内,且
平面PBD,求直线BN与平面ABCD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d316c9739b68261e38e1fc97f24cf8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/a60e0c8d-4932-49d7-be2b-aeee35e06efc.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
(2)设点N在平面PAD内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
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解题方法
【推荐2】如图,在底面为平行四边形的四棱锥
中,过点
的三条棱
两两垂直且相等,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449813636521984/2451982191616000/STEM/c308128967874f64a2dd2f017b75f6c8.png?resizew=203)
(1)证明:
平面
;
(2)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb37e5798de91c0293f18c5c91fb931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d70de1ffdd9aa376b09bbcfa12644a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0caec42cbc72c0d2b61a99f8887a80ac.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449813636521984/2451982191616000/STEM/c308128967874f64a2dd2f017b75f6c8.png?resizew=203)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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(0.65)
名校
【推荐1】在三棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/39544dd4-de51-4094-9b7d-ac219b44e764.png?resizew=264)
(1)证明:
;
(2)若
,
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7bce5b3862e12e5c7d206c35052471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2f04faf03ca18388df766d654af211.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/39544dd4-de51-4094-9b7d-ac219b44e764.png?resizew=264)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40154fd2f71e4621d800834f3656fd40.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962ddfa6a45e5588279c2a93f142924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74848ad66000fd0270cafe90d754ef1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dba91f88e6404c86a48df67fdb6d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解答题-作图题
|
适中
(0.65)
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【推荐2】如图,平面
平面ABCD,四边形ABCD是边长为4的正方形,
,M是CD的中点.
(2)求证:
;
(3)当
时,求PC与平面ABCD所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbad7ad1465d1c4c177e3321e6ed12a.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
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解答题-证明题
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适中
(0.65)
【推荐3】如图,在多面体
中,四边形
是矩形,四边形
是直角梯形,
,
,
,
与
交于点
,连接
.
(1)证明:
平面
;
(2)若
,求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e117d1180f9e220ca302d2a6400cf05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a47dcb24ffe20e8153e0d113ff8bee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6883efdf5726e10698bb4896cbb7c466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/11/88cb27e1-6611-4636-8b4a-16a92675be7b.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d786346b0e3f2d6666a2e7bf0b7e1251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
您最近一年使用:0次