如图,在正方形ABCD中,点M是AB上一动点,点E是CM的中点,AE绕点E顺时针旋转90°得到EF,连接DE,DF.给出结论:①DE=EF;②∠CDF=45°;③若正方形的边长为2,则点M在射线AB上运动时,CF有最小值
.其中结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
A.①②③ | B.①② | C.①③ | D.②③ |
2021·山东德州·一模 查看更多[8]
2021年山东省德州市庆云县渤海中学中考数学一练试卷2022年山东省德州市武城县九年级下学期第一次练兵数学试题 2022年山东省德州市武城县中考一模数学试题2022年广东省东莞市石龙第三中学初中学业水平模拟(三模)数学试题(已下线)第23章 旋转(基础、常考、易错、压轴)分类专项训练-2022-2023学年九年级数学考试满分全攻略(人教版)浙江省金华市义乌市绣湖中学2022-2023学年九年级上学期12月月考数学试题江苏省无锡市江阴市敔山湾实验学校2023-2024学年九年级上学期第一次作业检查数学试题(已下线)2024年重庆市中考数学真题(A卷)变式题6-10题
更新时间:2022-03-15 10:39:04
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【推荐1】如图,已知四边形ABCD是边长为4的正方形,E为CD上一点,且DE=1,F为射线BC上一动点,过点E作EG⊥AF于点P,交直线AB于点G.则下列结论中:①AF=EG;②若∠BAF=∠PCF,则PC=PE;③当∠CPF=45°时,BF=1;④PC的最小值为
﹣2.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481413812748288/2484354957860864/STEM/40533a541ad64827a62e0d1820d8d0bc.png?resizew=176)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,已知等边△ABC和等边△PAF,过P作PE⊥AC于E,Q为BC延长线上一点,连接PQ交AC边于D,当PA=CQ,AB=1时,DE的长( )
![](https://img.xkw.com/dksih/QBM/2016/8/18/1574230513557504/1574230519914496/STEM/cd4b73c1f46844eea350db538a6e7ec6.png)
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A.![]() | B.![]() | C.![]() | D.不能确定 |
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【推荐1】如图,正方形
中,
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的平分线交
于点
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上截取
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于点
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是线段
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于点
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;②
;③
;④
的最小值是
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A.①②③④ | B.①②③ | C.①②④ | D.①③ |
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【推荐2】如图,在正方形
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/64117204-43c3-4279-af66-56ae6779cdfc.png?resizew=125)
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【推荐1】如图,在正方形
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顺时针旋转
得
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;⑤若正方形的边长为
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在射线
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