如图,在正方形ABCD中,点E、F分别是边BC和CD上的两点,若AB=1,△AEF为等边三角形,则CE=( )
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550943935381504/2551707171127296/STEM/c8a0ac747d1b4744bc6a6b1dcd518ea0.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/2020/9/16/2550943935381504/2551707171127296/STEM/c8a0ac747d1b4744bc6a6b1dcd518ea0.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.![]() |
2020·陕西·一模 查看更多[6]
2020年陕西省陕西师范大学附属中学中考数学一模试题广东省茂名市化州市2020-2021学年九年级下学期期中质量测评数学试题(中考模拟)(已下线)【万唯原创】2021年山西专项集训-选填专项训练 题型十五、十六(已下线)【万唯原创】2021年陕西省试题研究-练册-第五章42022年山东省东营初中学业水平模拟考试数学试题(已下线)第3讲 正方形的性质与判定-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(北师大版)
更新时间:2020-09-17 14:04:26
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【推荐1】如图,在
中,
,
平分
,
于E,有下列结论:①
;②
;③
;④
平分
;其中正确的是( )个.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/077f9ce0-d7c0-4f8e-911e-7c10d5b993a8.jpg?resizew=143)
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A.1 | B.2 | C.3 | D.4 |
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【推荐2】如图,DE⊥AB于E,DF⊥AC于F,若BD=CD,BE=CF,则下列结论:①DE=DF;②AD平分∠BAC;③AE=AD;④AC-AB=2BE中,正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/e323db05-0d1e-43f9-95ab-e34121141db7.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/e323db05-0d1e-43f9-95ab-e34121141db7.png?resizew=172)
A.①②③ | B.①②③④ | C.①②④ | D.②③④ |
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【推荐1】把一副三角板如图甲放置,其中∠ACB=∠DEC=90°,∠A-45°,∠D=30°,斜边AB=6,DC=7,把三角板DCE绕着点C顺时针旋转15°得到△D1CE1(如图乙),此时AB与CD1交于点O,则线段AD1的长度为( )
A.![]() | B.5 | C.4 | D.![]() |
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【推荐2】如图,在平面直角坐标系xOy中,
,B(0,3),P为线段AB的中点,则线段OP的长为( )
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A.![]() | B.2 | C.![]() | D.5 |
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【推荐1】如图,在△ABC中,∠CAB=45°,以其三边为边向外作正方形,连接GC并延长交BH于点L,过点C作CK⊥DE于点K.若L为BH中点,则
的值为( )
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【推荐2】如图,已知
,点
为
上的一点,在
同侧作正方形
,正方形
分别为对角线
的中点,连结
当点
沿着线段
由点
向点
方向上移动时,四边形
的面积变化情况为( )
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