如图,在矩形纸片ABCD中,AB=2,AD=3,点E是AB的中点,点F是AD边上的一个动点,将△AEF沿EF所在直线翻折,得到△A′EF,则A′C的长的最小值是______ .
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358351671296/1930322234564608/STEM/4385217709f5468ea1b94fd42d73077c.png?resizew=181)
2017高三·全国·专题练习 查看更多[1]
(已下线)《2017届优生百日闯关系列》【专题一】第一关 以几何图形中的动点最值问题为背景的选择填空题
更新时间:2018-04-23 15:53:33
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【知识点】 几何证明选讲
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【推荐1】如图,△ABC是圆O的内接三角形,PA是圆O的切线,A为切点,PB交AC于点E,交圆O于点D,若PE=PA,∠ABC=60°,且PD=1,BD=8,则AC=________ .
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758848847544320/1815766069764096/STEM/c83a1509823e4701b3350072c59b50ed.png?resizew=121)
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【推荐2】(几何证明选讲选做题)如图2,⊙
的两条割线与⊙
交于
、
、
、
,圆心
在
上,若
,
,
,则![](https://img.xkw.com/dksih/QBM/2015/5/4/1572092153012224/1572092158943232/STEM/e88b0ee563a24909b720802057fc38ba.png?resizew=39)
________ .
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572092153012224/1572092158943232/STEM/0f6d930e8c1641af968460607ea093e0.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572092153012224/1572092158943232/STEM/0f6d930e8c1641af968460607ea093e0.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2015/5/4/1572092153012224/1572092158943232/STEM/c011fd7ef5144e5f896121071004f733.png?resizew=16)
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