如图,矩形ABCD中,AB=4, BC =3, E为AB边上一动点,以DE为边向右作正方形DEFG,连接CF,则CF的最小值为______ .
![](https://img.xkw.com/dksih/QBM/2021/11/30/2862428609839104/2862527284445184/STEM/4d8b21fb-f61a-4477-8c28-704202b3b30b.png?resizew=205)
2021九年级·全国·专题练习 查看更多[2]
更新时间:2021-11-30 17:29:34
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【推荐1】如图,在△ABC中,∠BAC=90°,AC=6cm,AB=8cm,AD⊥BC于D,与BD等长的线段EF在边BC上沿BC方向以1cm/s的速度向终点C运动(运动前EF与BD重合),过E,F分别作BC的垂线交直角边于P,Q两点,设EF运动的时间为x(s).
(1)线段EF运动过程中,四边形PEFQ成为矩形时x的值________ ;
(2)以A,P,Q为顶点的三角形与△ABC相似时x的值________ .
(1)线段EF运动过程中,四边形PEFQ成为矩形时x的值
(2)以A,P,Q为顶点的三角形与△ABC相似时x的值
![](https://img.xkw.com/dksih/QBM/2022/9/11/3063975397195776/3064371730923520/STEM/d9308b9223824ac4b718cee406df5395.png?resizew=210)
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【推荐2】如图,在
中,
,
,D为
边上的一个动点,连接
,以
为直径作圆交
于点P,连接
,则
的最小值是______ .
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【推荐1】如图,边长为2的正方形
中,动点
在边
上,射线
上取一点
,使
,当动点
从点
出发向终点
运动时,点
的运动路径长为 _____ ,线段
的最大值是 _____ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】如图,正方形
的边长是8,点E在
上,点F在
上,
,若
.则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,已知矩形
的边
将矩形的一部分沿
折叠,使
点与
点重合,点
的对应点为
,则
的长是______ 将
绕看点
顺时针旋转角度
得到
直线
分别与射线
,射线
交于点
当
时,
的长是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1844834ef0315a704d8e2fba77544.png)
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【推荐2】如图,在矩形
中,
,
是边
上一动点,
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时,矩形
外接圆的半径长度为____________ .
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