1 . 正三棱锥
的底面边长为
,高为
,它在六条棱处的六个二面角(侧面与侧面或者侧面与底面)之和记为
,则在
从小到大的变化过程中,
的变化情况是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4fe52baabb3071d55134f157a6079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76a4520612509efb80162b511603bf42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
A.一直增大 | B.一直减小 | C.先增大后减小 | D.先减小后增大 |
您最近一年使用:0次
2 . 等腰直角三角形
的斜边AB为正四面体
侧棱,直角边AE绕斜边AB旋转,则在旋转的过程中,有下列说法:
![](https://img.xkw.com/dksih/QBM/2018/6/8/1962869359099904/1967931105476608/STEM/120fd73d5ca349f59e4e9efba8507e01.png?resizew=146)
(1)四面体E
BCD的体积有最大值和最小值;
(2)存在某个位置,使得
;
(3)设二面角
的平面角为
,则
;
(4)AE的中点M与AB的中点N连线交平面BCD于点P,则点P的轨迹为椭圆.
其中,正确说法的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2018/6/8/1962869359099904/1967931105476608/STEM/120fd73d5ca349f59e4e9efba8507e01.png?resizew=146)
(1)四面体E
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
(2)存在某个位置,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
(3)设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d87b527147cb8dbb475bcefc0da2e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df1d9dcf1be61e7fa0d74ca9b70a5bc.png)
(4)AE的中点M与AB的中点N连线交平面BCD于点P,则点P的轨迹为椭圆.
其中,正确说法的个数是( )
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2018-06-29更新
|
1515次组卷
|
4卷引用:【全国百强校】浙江省杭州市第二中学2018届高三仿真考数学试题
【全国百强校】浙江省杭州市第二中学2018届高三仿真考数学试题2018届浙江省杭州二中高三下学期高考适应性考试数学试题(已下线)理科数学-2022年高考考前押题密卷(全国乙卷)内蒙古呼伦贝尔市海拉尔第二中学2022届高三下学期最后一模数学(理)试题
3 . 在三棱锥
中,点
在底面的正投影恰好落在等边
的边
上,点
到底面
的距离等于底面边长.设
与底面所成的二面角的大小为
,
与底面所成的二面角的大小为
,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c1f914da4657eca7865982b130b299.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
4 . 已知菱形
的边长为
,
,沿对角线
将菱形
折起,使得二面角
的余弦值为
,则该四面体
外接球的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86db010859f7a243badec02946a4e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30d314a642667fef559032264647366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-05-02更新
|
1745次组卷
|
7卷引用:【全国省级联考】广东省2018届高三下学期模拟考试(二)数学(理)试题
解题方法
5 . 如图,将正方形
沿着边
抬起到一定位置得到正方形
,并使得平面
与平面
所成的二面角为
,
为正方形
内一条直线,则直线
与
所成角的取值范围为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccfd81d120348601cd611241d1a5dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2018/4/18/1926565310963712/1928747278499840/STEM/ac554dd430f2419e859dd457af7edea7.png?resizew=132)
您最近一年使用:0次
解题方法
6 . 如图,矩形
与
所成的二面角的平面角的大小是
,
,
,现将
绕
旋转一周,则在旋转过程中,直线
与平面
所成角的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a087749d28290a98d8177160b34961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/8959c565-41a7-4f2e-8d1b-5865f1bba339.png?resizew=201)
您最近一年使用:0次
名校
解题方法
7 . 在三棱锥
中,
与
都是边长为2的正三角形,且平面
平面
,则该三棱锥外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 已知直角三角形
的两条直角边
,
,
为斜边
上一点,沿
将三角形折成直二面角
,此时二面角
的正切值为
,则翻折后
的长为
![](https://img.xkw.com/dksih/QBM/2017/8/25/1759689364471808/1760447587983360/STEM/d19a9aed8f1f4fe6833325a3d293208f.png?resizew=113)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/678f25053b4d4081b6726968f8b1c9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2017/8/25/1759689364471808/1760447587983360/STEM/d19a9aed8f1f4fe6833325a3d293208f.png?resizew=113)
A.2 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 在菱形
中,
,将
沿
折起到
的位置,若二面角
的大小为
,三棱锥
的外接球球心为
,
的中点为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a903538428f3dea2713fe721ce4f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5c327777d0ebb29bb2760dbffcce67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e2a5a8708c06d509c766863a4d6279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a7ba7cd0c654714c967a900513ba16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a903538428f3dea2713fe721ce4f4f.png)
A.1 | B.2 | C.![]() | D.![]() |
您最近一年使用:0次
2017-04-13更新
|
2421次组卷
|
7卷引用:2017届广西桂林市、崇左市、百色市高三下学期第一次联合模拟(一模)考试理数试卷
2017届广西桂林市、崇左市、百色市高三下学期第一次联合模拟(一模)考试理数试卷 山西省大同市第一中学2017-2018学年高二上学期期中考试数学试题1山西省大同市第一中学2017-2018学年高二上学期期中考试数学试题2(已下线)专题8-1 外接球-2(已下线)专题6-1立体几何动点与外接球归类-1(已下线)第二章 立体几何中的计算 专题六 几何体的外接球、棱切球、内切球 微点11 二面角的四面体模型【基础版】(已下线)专题09 外接球、内切球与动点最值(1) -期末考点大串讲(苏教版(2019))