如图,把
纸片沿
折叠,当点A落在四边形
的外部时,请试着找一找这个规律,你发现的规律是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/fc3e1b25-c3e6-4a28-94c8-5f56af6e5678.png?resizew=165)
更新时间:2024-01-16 19:20:55
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【推荐1】如图,在△ABC中,∠B=40°,三角形的外角∠DAC和∠ACF的平分线交于点E,则∠AEC=_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/a2042dde-6d1f-46a0-82b4-80862c45394c.png?resizew=158)
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【推荐2】如图,△ABC中,分别延长△ABC的边AB、AC到D、E,∠CBD与∠BCE的平分线相交于点P,爱动脑筋的小明在写作业的时发现如下规律:
(1)若∠A=60°,则∠P= °;
(2)若∠A=40°,则∠P= °;
(3)若∠A=100°,则∠P= °;
(4)请你用数学表达式归纳∠A与∠P的关系 .
(1)若∠A=60°,则∠P= °;
(2)若∠A=40°,则∠P= °;
(3)若∠A=100°,则∠P= °;
(4)请你用数学表达式归纳∠A与∠P的关系 .
![](https://img.xkw.com/dksih/QBM/2018/12/29/2107199493488640/2108532872331264/STEM/df5528c288d543f0b45ce290d4bbd868.png?resizew=273)
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【推荐1】如图,
为等腰直角三角形,
,将
按如图方式进行折叠,使点A与
边上的点F重合,折痕分别与
交于点D,点E.下列结论:①
;②
;③
;④
.其中一定正确的结论序号为______ .
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【推荐2】如图所示,将△ABC沿着DE翻折,若∠1+∠2=70°,则∠B=________ .
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【推荐1】如图,在
中,
,将
绕点
逆时针旋转到
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上时,
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______ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c157441734cc2f1853bb3e15b631a2.png)
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【推荐2】如图,在
中,
为直角,由图中的尺规作图痕迹得到的直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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