名校
解题方法
1 . 远看曲靖一中文昌校区紫光楼主楼,一顶巨大的“博士帽”屹立在爨园之中.其基础主体结构可以看做是一个倒扣的正四棱台
.如图所示,过
作底面
的垂线,垂足为G.记
,
,
,面
与面
所成角为
,面
与面
所成角为x,
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d7c9001717a5a04c4eee2c98bed4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d70d5a39044f808980ca8587766e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d55ce97d97240622bee2dd066809ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06bc9ebc09748382b644bac7bcb3215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2361a524115b309de21149fc57188eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee13374ece581c58330639a820b07f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/d5233f67-e141-49ab-93c1-56d659930a30.png?resizew=373)
A.正四棱台![]() ![]() |
B.![]() |
C.![]() |
D.![]() |
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2024-01-03更新
|
379次组卷
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2卷引用:广东省广州市广东实验中学2024届高三上学期大湾区数学冲刺卷(三)
名校
2 . 如图,设
与
为两个正四棱锥,且
,点P在线段AC上,且
.
(1)记二面角
,
的大小分别为
,
,求
的值;
(2)记EP与FB所成的角为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5ba482836565abad208665cf7b9972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cec68a1111227d3b2aa12b291dc8216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c59ab7424bf77688eb767f7642efd70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/26cd9d84-8989-48f8-9ed2-0bca7835803f.png?resizew=165)
(1)记二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325fbf7c39864c58789bc8ebe853dbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47342449ca1a78a7550975a7589003c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9f81357f842b71ea97d5174ec526a1.png)
(2)记EP与FB所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
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2023-11-28更新
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4卷引用:广东省广州市华南师大附中2024届高三上学期大湾区数学预测卷(一)
广东省广州市华南师大附中2024届高三上学期大湾区数学预测卷(一)安徽省示范高中培优联盟2023-2024学年高三上学期秋季联赛数学试题吉林省长春市朝阳区吉大附中实验学校2024届高三下学期开学考试数学试题(已下线)第二章 立体几何中的计算 专题一 空间角 微点10 二面角大小的计算综合训练【培优版】
解题方法
3 . 若空间中经过定点O的三个平面
,
,
两两垂直,过另一定点A作直线l与这三个平面的夹角都相等,过定点A作平面
和这三个平面所夹的锐二面角都相等.记所作直线l的条数为m,所作平面
的个数为n,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
A.4 | B.8 | C.12 | D.16 |
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名校
解题方法
4 . 棱长都相等的正四棱锥的侧面与底面所成的二面角大小为α,两相邻侧面所成的二面角大小为β,不相邻两侧面所成的二面角大小为γ,则( )
A.β=2α | B.γ=2α | C.β+γ=π | D.cos2α+cosβ=0 |
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2022-07-01更新
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565次组卷
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5卷引用:广东省广州市四校2023届高三上学期第二次模拟联考数学试题
广东省广州市四校2023届高三上学期第二次模拟联考数学试题江苏省镇江市2021-2022学年高一下学期期末数学试题陕西省西安市西咸新区泾河新城第一中学2022-2023学年高一下学期5月质量检测数学试题安徽省合肥一六八中学2021-2022学年高二上学期第三次月考数学试题(已下线)第二章 立体几何中的计算 专题一 空间角 微点8 二面角大小的计算综合训练【基础版】
名校
5 . 如图所示,从一个半径为
(单位:
)的圆形纸板中切割出一块中间是正方形,四周是四个正三角形的纸板,以此为表面(舍弃阴影部分)折叠成一个正四棱锥
,则以下说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7affd362b4b1b24ac16f5af57822a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
A.四棱锥![]() ![]() |
B.四棱锥![]() ![]() |
C.异面直线![]() ![]() ![]() |
D.二面角![]() ![]() |
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2021-11-02更新
|
2162次组卷
|
5卷引用:广东省广州协和学校2023-2024学年高二下学期期中考试数学试题
6 . 在如图所示的圆台中,
是圆台的轴截面,
,
分别是上、下底面圆的圆心,
是下底面圆周上异于
,
的一点,设圆台的上、下底而圆的半径分别为
与
,高为
,体积为
.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760252207202304/2790354858409984/STEM/67614575-75d5-451e-9825-897e7386b609.png?resizew=306)
(1)若
,
外别是
与
的中点,试判断直线
与平面
的位置关系,并加以证明;
(2)若
,求二面角
的正切值;
(3)在估测圆台的体积时,常用近似公式
来计算,其中圆台的中截面是指与上、下两个底而平行,且到两个底面距离相等的截而,试判断与
与
的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d33602cdebfa2ce11913f13da2bd861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760252207202304/2790354858409984/STEM/67614575-75d5-451e-9825-897e7386b609.png?resizew=306)
(1)若
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5333d85c95349bb62729f7ac91e81fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5617a404c5a3356753136e5a6b6d51e5.png)
(3)在估测圆台的体积时,常用近似公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb55d3a56d4c7fa5127e11e463d9fcf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212da8a37577d441928d41770e982e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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