如图,在△ABC中,已知∠C=90°,AC=BC=4,D是AB的中点,点E、F分别在AC、BC边上运动(点E不与点A、C重合),且保持AE=CF,连接DE、DF、EF.在此运动变化的过程中,有下列结论:
①四边形CEDF有可能成为正方形;
②△DFE是等腰直角三角形;
③四边形CEDF的面积是定值;
④点C到线段EF的最大距离为
.
其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2015/9/9/1573910794108928/1573910800064512/STEM/68c3fa1808874342b7f8353f2a003645.png)
①四边形CEDF有可能成为正方形;
②△DFE是等腰直角三角形;
③四边形CEDF的面积是定值;
④点C到线段EF的最大距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2015/9/9/1573910794108928/1573910800064512/STEM/68c3fa1808874342b7f8353f2a003645.png)
A.①④ | B.②③ | C.①②④ | D.①②③④ |
更新时间:2016-12-05 18:32:37
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【知识点】 根据正方形的性质与判定求线段长
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