如图,
是线段
在投影面上的正投影,已知
,则投影
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3f383faf554a9761f180f5c121238b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/3a1e9a8b-6b3b-49e8-b666-580716d61050.png?resizew=157)
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更新时间:2024-03-23 09:53:46
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【推荐1】位于重庆西部的融创文旅城是集商场、室内乐园、室外飞天项目、渝乐小镇于一体的大型文娱项目,小明为了测量室外飞天项目中摩天轮最高处点
距离地面
的高度
,他先是在
处测得顶点
的仰角为
,然后沿水平向摩天轮方向前行了50米到达
处,再沿着坡比为
的小山坡走到点
,测得
米,此时点
到
的水平距离为70米,
与地面
垂直,则摩天轮最高处点
距离地面
的高度
约为(参考数据:
)( )米
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730643047333888/2730687006056448/STEM/7cc95b3c-9b88-468f-91f6-b8d52850f417.png)
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【推荐2】如图,
是线段
在投影面P上的正投影,
,
,则投影
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/f9bcc367-79ad-4753-bba0-34932e5f5151.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
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名校
【推荐1】如图,在边长为1的小正方形网格中,点A、B、C、D都在这些小正方形的顶点上,
相交于点O,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
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【推荐2】如图,在
中,
,点D是
边上一点,连接
,点E是线段
延长线上一点,连接
,
.使
,过点C作
,交
于点F.若
,则线段
与
之间的数量关系为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/f65e4f58-e700-43e5-ad95-4e880e468dd0.png?resizew=131)
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【推荐1】几何体在平面P的正投影,取决于( )
①几何体形状;②投影面与几何体的位置关系;③投影面P的大小.
①几何体形状;②投影面与几何体的位置关系;③投影面P的大小.
A.①② | B.①③ | C.②③ | D.①②③ |
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【推荐2】把一个正六棱柱如图水平放置,一束水平方向的平行光线照射此正六棱柱时的正投影是( )
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