如图,Rt
ABC中,
BAC=90
,
B=30
, BC=8 ,则AC=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6595597d25112f247753397d25bf5080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450624107855872/2453480628043776/STEM/b54f04480b4e419e948e1669942e35b9.png?resizew=103)
更新时间:2020-05-01 19:22:01
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【知识点】 含30度角的直角三角形解读
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【推荐1】如图,在△ABC中,AB=BC,∠ABC=30°,BD平分∠ABC交AC于点D,BC的垂直平分线EF交BC于点E,交BD于点F,若BF=6,则AC的长为____ .
![](https://img.xkw.com/dksih/QBM/2019/11/8/2333781487558656/2347649176125440/STEM/3c7173f2ebec455fa03ccd099fa3c258.png?resizew=168)
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【推荐2】如图,在
中,
,D为
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,垂足分别为E,F,且
,则线段
的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
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