如图,撑伞时,把伞“两侧的伞骨”和支架分别看作
、
和
、
,始终有
,请大家考虑一下伞杆
与B、C的连线
的位置关系为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9848996becfe03d1c31a351b41f39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/9/14/2808042586251264/2808107341193216/STEM/99c0913c-1bab-4a29-a229-0949612abfb7.png)
更新时间:2021-09-17 16:49:57
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【知识点】 线段垂直平分线的判定解读
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【推荐1】如图,正方形ABCD的三边中点E、F、G.连ED交AF于M,GC交DE于N,下列结论:
①GM⊥CM;
②CD=CM;
③四边形MFCG为等腰梯形;
④∠CMD=∠AGM,其中正确的有____________ .
①GM⊥CM;
②CD=CM;
③四边形MFCG为等腰梯形;
④∠CMD=∠AGM,其中正确的有
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943791459057664/3059894524993536/STEM/b7e582693d72413b8465f3aa9a05aea1.png?resizew=142)
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【推荐2】如图,
是边长为
的等边三角形,点
在
上且
,点
从点
出发,向点
运动,同时点
从点
出发,以相同的速度向点
运动,当点
到达点
时,运动停止,
和
相交于点
,连接
,在此过程中线段
长度的最小值是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c97d73a687d728eb0b265d389c5d92.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061283113017344/null/STEM/07b152dd94514eefb9fbe1fc6e0df48c.png?resizew=134)
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