名校
解题方法
1 . 设一个简单几何体的表面积为
,体积为
,定义系数
,已知球体对应的系数为
,定义
为一个几何体的“球形比例系数”.
(1)计算正方体和正四面体的“球形比例系数”;
(2)求圆柱体的“球形比例系数”范围;
(3)是否存在“球形比例系数”为0.75的简单几何体?若存在,请描述该几何体的基本特征;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e32d2d3759b3edd79ef82c1f61d3f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb75fdaefb95f5061a0b33c2559f446b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d66edadaad08a904172a9c162529b57.png)
(1)计算正方体和正四面体的“球形比例系数”;
(2)求圆柱体的“球形比例系数”范围;
(3)是否存在“球形比例系数”为0.75的简单几何体?若存在,请描述该几何体的基本特征;若不存在,说明理由.
您最近一年使用:0次
名校
解题方法
2 . 在四棱锥P−ABCD中,
,正方形ABCD的边长为2,
平面ABCD,则下列选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
A.该四棱锥的外接球表面积为![]() |
B.若点E为PA的中点,则![]() |
C.若点Q在![]() ![]() ![]() |
D.若点M在正方形ABCD内(不含边界),且![]() ![]() |
您最近一年使用:0次
名校
3 . 已知四面体
的顶点
,
,
,
均在球
的球面上,
是边长为2的等边三角形,
,棱
,
,
的中点分别为
,
,
,过
,
,
三点的平面截四面体所得截面四边形的对角线互相垂直,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbab4a3f9636fe3eeee75ba79d08a52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/73465a1f9aa03481295bf6bd3c6903ac.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/73465a1f9aa03481295bf6bd3c6903ac.png)
A.![]() |
B.![]() ![]() |
C.直线![]() ![]() |
D.球![]() ![]() |
您最近一年使用:0次
4 . 用两个平行平面去截球体,把球体夹在两截面之间的部分称为球台.根据祖暅原理(“幂势既同,则积不容异”),推导出球台的体积
,其中
分别是两个平行平面截球所得截面圆的半径,
是两个平行平面之间的距离.已知圆台
的上、下底面的圆周都在球
的球面上,圆台
的母线与底面所成的角为
,若圆台
上、下底面截球
所得的球台的体积比圆台
的体积大
,则球O的表面积
与圆台
的侧面积
的比值
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbb6f33f82a6e40c2b76d950d7e318a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8543261a8e351eb95cdfebb001a3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e95a79288fcb7e47fba4410722e2bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
您最近一年使用:0次
2024·全国·模拟预测
5 . 如图1,一圆形纸片的圆心为
,半径为
,以
为中心作正六边形
,以正六边形的各边为底边作等腰三角形,使其顶角的顶点恰好落在圆
上,现沿等腰三角形的腰和中位线裁剪,裁剪后的图形如图2所示,将该图形以正六边形的边为折痕将等腰梯形折起,使得相邻的腰重合得到正六棱台.若该正六棱台的高为
,则其外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
6 . 球面上的三个点,每两个点之间用大圆劣弧相连接,三弧所围成的球面部分称为球面三角形.半径为
的球面上有三点
,且
,则球面三角形
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b7c1356f8e66f93d414b2a91e87cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
7 . 如图,已知圆锥PO的底面半径为
,高为
,AB为底面圆的直径,点C为底面圆周上的动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
A.当C为弧AB的三等分点时,△PAC的面积等于![]() ![]() |
B.该圆锥可以放入表面积为![]() |
C.边长为![]() |
D.该圆锥可以放入边长为![]() |
您最近一年使用:0次
名校
解题方法
8 . 球面几何学是在球表面上的几何学,也是非欧几何的一个例子.对于半径为R的球
,过球面上一点
作两条大圆的弧
,
,它们构成的图形叫做球面角,记作
(或
),其值为二面角
的大小,点
称为球面角的顶点,大圆弧
称为球面角的边.不在同一大圆上的三点
,可以得到经过这三点中任意两点的大圆的劣弧
,这三条劣弧组成的图形称为球面
,这三条劣弧称为球面
的边,
三点称为球面
的顶点;三个球面角
称为球面
的三个内角.
的单位球面上有不同在一个大圆上的三点
.
(1)球面
的三条边长相等(称为等边球面三角形),若
,求球面
的内角和;
(2)类比二面角,我们称从点
出发的三条射线
组成的图形为三面角,记为
.
其中点
称为三面角的顶点,
称为它的棱,
称为它的面角. 若三面角
的三个面角的余弦值分别为
.
(ⅰ)求球面
的三个内角的余弦值;
(ⅱ)求球面
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcdeb8eb2d5a8a7f1c81071ae349504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2dcc2105ebb1c89bfb1572a7e076e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19c1bcb8431ae315ecd29c6478d3eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef528373d472534670a8fd7fb301492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1b98b1478ed9480a9e1a62ec3b82da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e037d52e5d75070cd02df4727b5922d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(1)球面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814dc3914cdf4d5af2f4cfadf41c260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)类比二面角,我们称从点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f673831a6738e1c317fede2920436d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de938433cfaf25cb38dd5c9d915bb2b.png)
其中点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f673831a6738e1c317fede2920436d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c93fa5e252ef36adfbffa39410f2b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4278c0911e7df78965e78cff69cac5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27029c4cc0fe55c8f4dbdb33beca9980.png)
(ⅰ)求球面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(ⅱ)求球面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
9 . 已知圆锥
的侧面展开图是圆心角为
,半径为2的扇形,
是两条母线,
是
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab709684151600ffd28410a8b2ca5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9fe8127948792720ee8c94945fd8aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11985558ada4af5aab3289d4c761ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff6089095a8b825eeb8002b6996929e.png)
A.圆锥![]() ![]() |
B.![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.圆锥![]() ![]() |
您最近一年使用:0次
解题方法
10 . 校足球社团为学校足球比赛设计了一个奖杯,如图,奖杯的设计思路是将侧棱长为6的正三棱锥
的三个侧面沿AB,BC,AC展开得到面
,使得平面
均与平面ABC垂直,再将球
放到上面使得
三个点在球
的表面上,若奖杯的总高度为
,且
,则球
的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a3857b390b5cd3618625795b0cd4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66a3857b390b5cd3618625795b0cd4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7807638578edd712265463a7a5eab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec978eb43bc4f9e7df83b0d0195dcda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次