如图,棱长为2的正方体
的内切球为球O,E、F分别是棱AB和棱
的中点,G在棱BC上移动,则下列结论成立的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/12/03dc889b-7aff-4bf6-803e-e97673f275e1.png?resizew=159)
A.存在点G,使![]() |
B.对于任意点G,![]() |
C.直线EF的被球О截得的弦长为![]() |
D.过直线EF的平面截球О所得的所有圆中,半径最小的圆的面积为![]() |
更新时间:2023-08-12 07:12:38
|
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解题方法
【推荐1】已知球
的直径
,
、
、
是球
表面上的三个不同的点,
,则( )
![](https://img.xkw.com/dksih/QBM/2020/11/13/2592300770566144/2604685823336448/STEM/7f686542864842c8a52425ae88f2f579.png?resizew=170)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06009c221785e3c65d2ace5d4a3807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dd42bbebdae76f1a1a8b1e3d5a7184e.png)
![](https://img.xkw.com/dksih/QBM/2020/11/13/2592300770566144/2604685823336448/STEM/7f686542864842c8a52425ae88f2f579.png?resizew=170)
A.![]() |
B.线段![]() ![]() |
C.三棱锥![]() |
D.过![]() ![]() |
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【推荐2】四面体
的四个顶点都在球
的球面上,且
,
,E、F、G分别为BC、CD、DA中点,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963830311510016/2970249962717184/STEM/b8f686f5-e2cd-4e0e-aeaf-c90c3f664ee5.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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A.平面![]() ![]() |
B.球![]() ![]() |
C.平面EFG截四面体ABCD所得截面的面积为2 |
D.平面EFG截球O所得截面面积为![]() |
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解题方法
【推荐1】在矩形
中,
,
,以对角线BD为折痕将△ABD进行翻折,折后为
,连接
得到三棱锥
,在翻折过程中,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
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A.三棱锥![]() ![]() | B.点![]() |
C.点![]() ![]() | D.当![]() ![]() |
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【推荐2】在矩形
中,
,沿矩形对角线
将
折起形成四面体,在折叠过程中,下列四个结论中正确的是( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f202a605f5b365cacb84ee6d76b4f835.png)
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A.在四面体![]() ![]() ![]() |
B.四面体![]() ![]() |
C.在四面体![]() ![]() ![]() ![]() |
D.四面体![]() |
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解题方法
【推荐1】在正方体
中,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.![]() | B.![]() ![]() |
C.直线![]() ![]() | D.二面角![]() |
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【推荐2】在棱长为
的正方体
中,点P在正方形
内
含边界
运动,则下列结论正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.若点P在![]() ![]() |
B.若![]() ![]() ![]() |
C.存在点P,使得平面PBD截该正方体的截面是五边形 |
D.若![]() ![]() |
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【推荐1】如图1,在等腰梯形ABCD中,
,
,E为CD中点,将
沿AE折起,使D点到达P的位置(点P不在平面ABCE内),连接PB,PC(如图2),则在翻折过程中,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
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A.![]() | B.![]() |
C.存在某个位置,使![]() | D.PB与平面ABCE所成角的取值范围为![]() |
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【推荐2】在正方体
中,点
是线段
上一动点,则下列各选项正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/2b32d92c-e0f9-44e9-81c5-e6b1e5356f1a.png?resizew=173)
A.![]() |
B.![]() ![]() |
C. 三棱锥![]() |
D.直线![]() ![]() ![]() |
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【推荐3】如图,在直四棱柱
中,底面
是菱形,点P,Q,M分别为
,
,
的中点,下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.![]() ![]() | B.该四棱柱有外接球,则四边形![]() |
C.![]() ![]() | D.![]() |
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