阅读下面的例题及点拨,并解决问题:
例题:如图①,在等边
中,
是
边上一点(不含端点
),
是
的外角
的平分线上一点,且
.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7d66eae0-c644-45fb-88a9-0ba6e6847b8d.png?resizew=141)
点拨:如图②,作
,
与
的延长线相交于点
,得等边
,连接
.易证:
,可得
;又
,则
,可得
;由
,进一步可得
又因为
,所以
,即:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/5a405139-1b3f-4ebe-9ced-eb9825bc5d94.png?resizew=148)
问题:如图③,在正方形
中,
是
边上一点(不含端点
),
是正方形
的外角
的平分线上一点,且
.求证:
.
例题:如图①,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca1951b1fe7ae822684ae2f7a877c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393d99d8768a1bdc0db594a11ad815fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7d66eae0-c644-45fb-88a9-0ba6e6847b8d.png?resizew=141)
点拨:如图②,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a531df73228cfda5c1382f45fb8c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362961a474bd478c3825367e292a09df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0a5b92b378b60f5280dbcdf27d3e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07168b258914af095657aec21ad89d64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0bd8869f34219e7fbe5a9b8842667c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad0564e14526c44ba7ffac253ba2b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4c2c88407bcb6f87b770bab029c0e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213b099e2bb86496ccb4db54ac2f9c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a74659236aac282c8607d6cfbf1414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393d99d8768a1bdc0db594a11ad815fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/5a405139-1b3f-4ebe-9ced-eb9825bc5d94.png?resizew=148)
问题:如图③,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564a094212a6ae5e14bef8fec5442bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca30af6bbc8607d9b9b3f3eb1a6a7dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b3244f4949cd185a8b87cc87aae671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ba6ae0d18c7aac879ec5e65525c43c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/ca568ce9-063d-4128-b466-d540512464cf.png?resizew=203)
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更新时间:2019-07-08 18:30:44
|
【知识点】 三角形的外角的定义及性质解读
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图1,已知
,点B为平面内一点,过点B作
于点D,
于B.
,则
______;
(2)求证:
;
(3)如图2,G在射线
上,当
平分
时,求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e02811a61a35537bf5e93f15c7f827a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e46ba5224d2f60ef6938717a4c48ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e129f11c22ffee99cb4026236755bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d715af2d0f55f1f8855361afee3fd0f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb138968e1bcbcd84e4dda73e0da7c8.png)
(3)如图2,G在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af342d3b871ace448ccc7c648528288.png)
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您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知
是等边三角形,点
分别在
上,且
.
(1)说明
的理由;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018fb1bfa58c028322889b7806f5a989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5817a44033087407b1c18845c17f9a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/a5955145-4096-4aed-abe1-3b1bdfbd2025.png?resizew=160)
(1)说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396a697a08cfae065977b27729523162.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90026b96116424a245b335b1adb886b.png)
您最近一年使用:0次