如图,点
,
在
外,连接
、
、
,且
.
(1)用尺规作图完成以下基本作图:作
的平分线
交
于点
,连接
(保留作图痕迹,不写作法,不下结论);
(2)根据(1)中的作图,若
,
,求证:
;请完善下面的证明过程.
证明:∵
平分
,
∴
① .
又∵ ② ,
∴
.
∴ ③ ,
∴
④ .
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7184b693f884484e8ad57c27dc04849.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f91d4581f2d9bba0a272ef5da15be22.png)
∴ ⑤ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880efdb2b4ac4861ad808e0162d082be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/e15b5d23-636e-40c7-93d8-2bca79d9d388.png?resizew=143)
(1)用尺规作图完成以下基本作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)根据(1)中的作图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd44e7b89f25f7242e009653f268d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7cecd2d5b7eac66bfd39a1d0b555b3.png)
又∵ ② ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8289b804775f99d4e883697ed90c3a.png)
∴ ③ ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7184b693f884484e8ad57c27dc04849.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f91d4581f2d9bba0a272ef5da15be22.png)
∴ ⑤ .
更新时间:2023-11-11 15:42:29
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【推荐2】如图,在
中,点
是
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(1)
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(2)探究:当点
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(3)在(2)中当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
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(1)
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(2)探究:当点
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(3)在(2)中当
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