已知:四边形ABCD中,AB=AD=CD,∠BAD=90°,三角形ABC的面积为1,则线段AC的长度是___________ .
![](https://img.xkw.com/dksih/QBM/2019/8/1/2259285738987520/2266311290896384/STEM/dd9c885f380c4d6a9955b1ade32f00f1.png?resizew=183)
更新时间:2019-08-11 08:45:02
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【知识点】 垂线模型(全等三角形的辅助线问题)
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【推荐1】在
中,
,
,点
是射线
上的一个动点,作
,且
,连接
交射线
于点
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325140ec50c30f2104bfb8502c0a72b3.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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【推荐2】如图,把一个等腰直角三角形放在平面直角坐标系中,∠ACB=90°,点C(-1,0),点B在反比例函数
的图像上,且y轴平分∠BAC,则k的值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/9309b220-5c56-4269-807b-dca44f28c7da.png?resizew=149)
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