1 . 如图所示,在四边形
中,
,
,
.将四边形
沿对角线
折成四面体
,使平面
平面
,则下列结论中正确的结论个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/0ceae6b6-f6b1-4138-a992-bca96069709f.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/408f7d9f-5fc9-44d1-b4cb-9050bc89ccd7.png?resizew=233)
①
;②
;
③
与平面
所成的角为
;
④四面体
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832afec35b94e7f73af80164b2b81c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe052786101dfcc941480919eb2cecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/0ceae6b6-f6b1-4138-a992-bca96069709f.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/408f7d9f-5fc9-44d1-b4cb-9050bc89ccd7.png?resizew=233)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b219a74a1ce5a2b22c36d8de1e21ff91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910fab9c432cda7e4642535638046094.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd148d264bc9043396f777523e907aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
④四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-03-05更新
|
607次组卷
|
6卷引用:湖北省孝感市2018-2019学年高一下学期期末数学试题
湖北省孝感市2018-2019学年高一下学期期末数学试题湖北省襄阳市2018-2019学年高一下学期期末数学试题湖北省随州市2018-2019学年高一下学期期末数学试题(已下线)【新东方】杭州新东方高中数学试卷332(已下线)【新东方】新东方高二数学试卷302(已下线)狂刷39 立体几何的综合-学易试题君之小题狂刷2020年高考数学(理)
名校
解题方法
2 . 已知三棱柱
的底面是正三角形,侧面
为菱形,且
,平面
平面
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/3/19/2423138566766592/2423630358208512/STEM/05a2608adae7431da5b603bf448c3633.png?resizew=217)
(1)求证:
平面
;
(2)求证:
;
(3)求
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70d708336d4f15e7fca0b26acb353b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2020/3/19/2423138566766592/2423630358208512/STEM/05a2608adae7431da5b603bf448c3633.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105ab9d3410dfa30318f378feb287350.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb9aa113258bfa138c95a621f64fc74.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7d857811cbd619f868d951aa7a0ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
您最近一年使用:0次
2020-03-20更新
|
664次组卷
|
4卷引用:湖北省荆门市2018-2019学年高一下学期期末数学试题
解题方法
3 . 如图,在三棱柱
中,平面
平面
,
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/cee7a7be-de0b-4532-a734-18422ceadea7.png?resizew=141)
(1)证明:
;
(2)求三棱柱
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fba6dc92460fa44832398fd2868940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4285e6b41d7c9f04e6d562dc9f514400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/cee7a7be-de0b-4532-a734-18422ceadea7.png?resizew=141)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9a1c949c2bb591c1db240d7874b089.png)
(2)求三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次
解题方法
4 . 如图,在三棱柱
中,平面
平面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddfd52a3543a23547e403090636fed4.png)
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/13df69d8-09d1-4274-9141-36b7ee0e3d02.png?resizew=187)
(1)证明:
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddfd52a3543a23547e403090636fed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9d8a9d1b2b30b817d9cdefa7d41788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4285e6b41d7c9f04e6d562dc9f514400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/13df69d8-09d1-4274-9141-36b7ee0e3d02.png?resizew=187)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9a1c949c2bb591c1db240d7874b089.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
您最近一年使用:0次
名校
5 . 如图,在三棱柱
中,各个侧面均是边长为
的正方形,
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a4a8e442-a867-4eda-8d10-f512c409c5a6.png?resizew=150)
(1)求证:直线
平面
;
(2)求直线
与平面
所成角的余弦值;
(3)设
为线段
上任意一点,在
内的平面区域(包括边界)是否存在点
,使
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a4a8e442-a867-4eda-8d10-f512c409c5a6.png?resizew=150)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0c0d0497f5d3f317504d59cc19a4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60476ff27b009fae801d39d0d31a2f8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5260b9927d0ad83b03c1e24c586e98.png)
您最近一年使用:0次
2019-07-15更新
|
722次组卷
|
3卷引用:湖北省省实验、武汉中学等学校联考2018-2019学年高一下学期期末数学试卷
解题方法
6 . 已知三棱锥
,
平面
,
,
,
,则三棱锥
的侧面积__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51508686bd1be74f4051142c670b57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
您最近一年使用:0次
2019-07-15更新
|
750次组卷
|
3卷引用:湖北省省实验、武汉中学等学校联考2018-2019学年高一下学期期末数学试卷
名校
7 . 如图所示,在正方形
中,点
,
分别为边
,
的中点,将
沿
所在直线进行翻折,将
沿
所在直线进行翻折,在翻折的过程中,
①点
与点
在某一位置可能重合;②点
与点
的最大距离为
;
③直线
与直线
可能垂直; ④直线
与直线
可能垂直.
以上说法正确的个数为
![](https://img.xkw.com/dksih/QBM/2019/6/19/2229167008399360/2229195693326336/STEM/511e9b40f9794e229fb6c4757a89d623.png?resizew=240)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b929a31d169a811004f0ecd6b7984e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13e3cc3d134bcf427ce2f896f7231f9.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
以上说法正确的个数为
![](https://img.xkw.com/dksih/QBM/2019/6/19/2229167008399360/2229195693326336/STEM/511e9b40f9794e229fb6c4757a89d623.png?resizew=240)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
2019-06-19更新
|
1160次组卷
|
4卷引用:湖北省十堰市丹江口市第一中学2021-2022学年高一下学期期末数学试题
8 . 如图,三棱柱
中,
,
,
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/e38bb12f-e507-4fc4-8e7d-5a17d506420c.png?resizew=175)
(1)证明:
平面
;
(2)证明:
;
(3)若
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3200c348848e321f6d30d762badce767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfb9c088a7422e95f747701a626513d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/e38bb12f-e507-4fc4-8e7d-5a17d506420c.png?resizew=175)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba985fb50a9078a839b66bf1d1eadea9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4908fad3dc6fe1b0675c870328f043ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
您最近一年使用:0次
9 . 如图,在底面为菱形的四棱锥
中,
平面ABCD,E为PC的中点
求证
;
在棱BC上是否存在一点F,使得
平面DEF?若存在,请求出点F的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77dca0e33db66ed5fcb6e5f797b99f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788230e67c76173c8a11b3b9aa6c9306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0651af49ab42b58098873b46975650.png)
![](https://img.xkw.com/dksih/QBM/2018/12/12/2095402525384704/2097249036697600/STEM/70e4e01037ed495094dab21e9fca2d26.png?resizew=180)
您最近一年使用:0次
2018高三·全国·专题练习
名校
10 . 如图,三角形
所在的平面与长方形
所在的平面垂直,
.点
是
边的中点,点
分别在线段
,
上,且
.
![](https://img.xkw.com/dksih/QBM/2018/9/17/2034385821270016/2049798758055936/STEM/a03b5f9266c543b595455265dd5de7af.png?resizew=242)
(1)证明:
;
(2)求二面角
的正切值;
(3)求直线
与直线PG所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8718e280689000b3d41a656262746d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231c3e0c5366da20b9c8de0423e7a7d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752e9efdef11566183e7a5998bce48d7.png)
![](https://img.xkw.com/dksih/QBM/2018/9/17/2034385821270016/2049798758055936/STEM/a03b5f9266c543b595455265dd5de7af.png?resizew=242)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3866b1582f16c44f50f9f97c274f9e.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e991b4cf241875ac06429b2cdea53e36.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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