如图1,在等腰梯形
中,
,
,
,
,
,将四边形
沿
进行折叠,使
到达
位置,且平面
平面
,连接
,
,如图2,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30e3e19f2daf6c6bdbaace49aae2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d400782997029c78349ab203df309b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a5e47abdf167620c32071f5c018fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d9c105f5558d48cc42218ed2b3ef4a.png)
A.![]() | B.平面![]() ![]() |
C.多面体![]() | D.直线![]() ![]() ![]() |
2024·河北保定·二模 查看更多[8]
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更新时间:2024-06-15 17:45:14
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【推荐1】下列说法不正确的是( )
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B.如果一个棱锥的各个侧面都是等边三角形,那么这个棱锥可能为六棱锥 |
C.棱长都是1的三棱锥的表面积为![]() |
D.正方体![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图,由正四棱锥
截去一部分后得到四棱台
,
,
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的对角线交点,
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A.几何体![]() | B.几何体![]() |
C.四棱台![]() ![]() | D.直线![]() ![]() ![]() |
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【推荐1】已知正方体
中,E为线段
上的一个动点(E可以与端点
、
重合),则下列结论中正确的是( )
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【推荐2】在正方体
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A.![]() ![]() | B.![]() ![]() |
C.平面![]() ![]() | D.平面![]() ![]() |
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【推荐1】如图,在平面四边形ABCD中,
和
是全等三角形,
,
,
.下面有两种折叠方法将四边形ABCD折成三棱锥.折法①将
沿着AC折起,形成三棱锥
,如图1;折法②:将
沿着BD折起,形成三棱锥
,如图2.下列说法正确的是( )
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A.按照折法①,三棱锥![]() ![]() |
B.按照折法①,存在![]() ![]() |
C.按照折法②,三棱锥![]() ![]() |
D.按照折法②,存在![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图,将正方形
沿对角线
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,则下列四个结论中正确的是( )
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A.![]() |
B.![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() |
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【推荐3】如图,在正方体
中,点E为棱
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A.![]() |
B.![]() ![]() |
C.![]() ![]() |
D.直线![]() ![]() ![]() |
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解题方法
【推荐1】菱形ABCD中,
,
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沿对角线BD翻折到
位置,连结PC,得到三棱锥
,则( )
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A.![]() | B.存在某个位置,使![]() |
C.三棱锥![]() | D.存在某个位置,使![]() ![]() |
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【推荐2】在棱长为的正方体
中,
为底面
的中心,
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的中点,则
( )
A.![]() ![]() |
B.三棱锥![]() ![]() |
C.存在两个不同的![]() ![]() |
D.![]() ![]() ![]() |
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【推荐3】如图,已知正方体
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A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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