完成下面的证明过程:
已知:如图,
,
,
.
求证:
.
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450610422661120/2453274294378496/STEM/80a5146bb4a04495ac62bd4c2e859918.png?resizew=179)
证明:∵
,
(已知)
∴
.
∴
,( )
又∵
,(已知)
∴______
,(内错角相等,两直线平行)
∴
_______,( )
∴
.( )
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615be61cdec9235a52d7779ea95e2b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860474d87841305ce9be4b197282532e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
![](https://img.xkw.com/dksih/QBM/2020/4/27/2450610422661120/2453274294378496/STEM/80a5146bb4a04495ac62bd4c2e859918.png?resizew=179)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615be61cdec9235a52d7779ea95e2b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860474d87841305ce9be4b197282532e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bce0b902d2369212efcd66aee479e7e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3591a6b94f7fde73bc159def5bca4702.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4aea4de9a527ee8509c7dc69ec99d7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1598ad60d36f87f7fed1a58cf5c2c42.png)
更新时间:2020-05-01 12:22:14
|
【知识点】 根据平行线的性质探究角的关系解读
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【推荐2】已知:AB是⊙O的直径,BC是⊙O的切线,切点为B,OC∥AD
求证:DC是⊙O的切线
求证:DC是⊙O的切线
![](https://img.xkw.com/dksih/QBM/2021/12/24/2879516293767168/2883812578041856/STEM/f62e3339-bb57-430d-854a-cd87d51030b6.png?resizew=138)
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