如图,A是直线l外一点,点B,E,D,C在直线l上,且
,D为垂足,如果量得
,
,
,
,则点A到直线l的距离为( )
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373256123015168/2373275144404992/STEM/e311a456-3fc5-45ae-a435-61dd108bfbd5.png?resizew=291)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13b505788d3d02bf232ac637fc3a8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5cff7ffd77eba4e77efea1e5a077ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad14f408a347d6ddcf9e87da713ccb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef56646dcd9e1f911a03621e7a75a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d7cc5454f9dceb6bc5778daa35675a.png)
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373256123015168/2373275144404992/STEM/e311a456-3fc5-45ae-a435-61dd108bfbd5.png?resizew=291)
A.11 cm | B.7 cm | C.6 cm | D.5 cm |
20-21七年级上·浙江杭州·期末 查看更多[4]
(已下线)【新东方】【杭州】7【2020年】【初一上】【期末考】浙江省杭州市西湖区2019-2020学年七年级上学期期末数学试题(已下线)5.1.2 垂线-2020-2021学年七年级数学下册十分钟同步课堂专练(人教版)浙江省杭州市西湖区公益中学2020-2021学年七年级上学期期末数学试题
更新时间:2020-01-09 11:43:33
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【知识点】 最短路径问题
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【推荐1】如图,在
中,点
是
边的中点,过点
作边
的垂线
,
是
上任意一点,
,
.则
的周长的最小值为( )
![](https://img.xkw.com/dksih/QBM/2021/8/18/2788902728138752/2792402107785216/STEM/04db09ee-5e0a-4051-856c-e735e3446c6f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,直线上的四个点A,B,C,D分别代表四个小区,其中A小区和B小区相距50m,B小区和C小区相距200m,C小区和D小区相距50m,某公司的员工在A小区有30人,B小区有5人,C小区有20人,D小区有6人,现公司计划在A,B,C,D四个小区中选一个作为班车停靠点,为使所有员工步行到停靠点的路程总和最小,那么停靠点的位置应设在( )
![](https://img.xkw.com/dksih/QBM/2021/10/14/2829394625216512/2833918918696960/STEM/605fefce-08f9-4985-826b-45681ac2027b.png)
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A.A小区 | B.B小区 | C.C小区 | D.D小区 |
您最近一年使用:0次