如图,已知
中,
,
平分
,请补充完整过程,说明
的理由.
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148611903324160/3156142603821056/STEM/158072206a1141f78cbc8b36f99cac7e.png?resizew=128)
证明:∵
平分
,
∴
__________(角平分线的定义)
在
和
中,
,
∴
(__________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148611903324160/3156142603821056/STEM/158072206a1141f78cbc8b36f99cac7e.png?resizew=128)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a2b104be37d7663966afb47fab83c7.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6445c632a3309e98eabbaaa5292e755f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901d94b32038d99ef9e748f1fe2b8c55.png)
更新时间:2023-01-19 13:31:28
|
【知识点】 用SAS直接证明三角形全等(SAS)解读
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