1 . 已知边长为6的等边
中,
是高
所在直线上的一个动点,连接
,将线段
绕点
顺时针旋转
得到
,连接
,则在点
运动的过程中,当线段
长度的最小值时,
的长度为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/05b2a39d-9500-411d-b0f3-5f5fdc7bc8dd.png?resizew=166)
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2 . 如图,△ABC为等边三角形,AB=8,AD⊥BC,点E为线段AD上的动点,连接CE,以CE为边作等边△CEF,连接DF,则线段DF的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/7aa626d0-418c-4eb7-8b64-b436bc3f1a1b.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/7aa626d0-418c-4eb7-8b64-b436bc3f1a1b.png?resizew=156)
A.![]() | B.4 | C.2 | D.无法确定 |
您最近一年使用:0次
2020-06-03更新
|
358次组卷
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4卷引用:山东省山东大学附属中学2019-2020学年八年级下学期期中数学试题
山东省山东大学附属中学2019-2020学年八年级下学期期中数学试题山东省济南市高新区第一中学2019-2020学年八年级下学期期中数学试题(已下线)【万唯原创】2021年河北试题研究-周周测-第十周(已下线)第1课时 图形的旋转-2022-2023学年九年级数学上册同步考点知识清单+例题讲解+课后练习(人教版)
3 . 已知△ABC是等边三角形,点D在BC边上,点E在AB的延长线上,将DE绕D点顺时针旋转120°得到DF.
![](https://img.xkw.com/dksih/QBM/2020/1/22/2382174874009600/2382628609015809/STEM/a64c85b059994fe6b9610d4caff18334.png?resizew=532)
(1)如图1,若点F恰好落在AC边上,求证:点D是BC的中点;
(2)如图2,在(1)的条件下,若
=45°,连接AD,求证:
;
(3)如图3,若
,连CF,当CF取最小值时,直接写出
的值.
![](https://img.xkw.com/dksih/QBM/2020/1/22/2382174874009600/2382628609015809/STEM/a64c85b059994fe6b9610d4caff18334.png?resizew=532)
(1)如图1,若点F恰好落在AC边上,求证:点D是BC的中点;
(2)如图2,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1ef22fd9b6f2714a2a57c9b2c50ee3.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2abe5da7ee1a2ff3ca5dec7a2d04dc.png)
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4 . 如图,在
中,
,
为
边的中点,
为等边三角形.
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352197650628608/2353090779553792/STEM/84d86939f6be4e6bbfbee283b7a8d9ac.png?resizew=125)
(1)求证:
;
(2)若
,在
边上找一点
,使得
最小,并求出这个最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352197650628608/2353090779553792/STEM/84d86939f6be4e6bbfbee283b7a8d9ac.png?resizew=125)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9299e3e10d37cfd8424a3bde0865d4b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda933f83112bed6bb4571b668f70de1.png)
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5 . 如图,四边形
是边长为
的正方形,
是
边的中点,
是直线
上的动点.连接
,将线段
逆时针旋转
得到
,连接
,则
的最小值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876386012020736/1876482947489792/STEM/1f0f538786234a3e9a7ab1fff93375dc.png?resizew=139)
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2018-02-11更新
|
330次组卷
|
2卷引用:陕西省师范大学附属中学2018届九年级上学期期中考试数学试题
6 . 如图,边长为a的等边△ACB中,E是对称轴AD上一个动点,连EC,将线段EC绕点C逆时针旋转60°得到MC,连DM,则在点E运动过程中,DM的最小值是_____ .
![](https://img.xkw.com/dksih/QBM/2016/3/18/1574184434515968/1574184440446976/STEM/8aa19c32-90bd-4f95-bcc4-31bcce15a3f3.png?resizew=183)
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2016-12-06更新
|
1132次组卷
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4卷引用:2016届江苏省泰州市靖江市九年级上学期期末数学试卷