如图,AD是△ABC的角平分线,∠B=90°,DF⊥AC,垂足为F,在AB上截取BE=CF.求证:△BDE≌△FDC
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571626879123456/2572798363009025/STEM/d51f803139d049819be2e3d44e17f9ef.png?resizew=88)
更新时间:2020-10-17 09:14:34
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解答题-证明题
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【推荐1】已知四边形
是菱形,
,
,
的两边分别与射线
,
相交于点
,
,且
,连接
.
初步感知:(1)如图1,当
是线段
的中点时,
与
的数量关系为______.
深入探究:(2)如图2,将图1中的
绕点A顺时针旋转
,(1)中的结论还成立吗?请说明理由.
拓展应用:(3)如图3,将图1中的
绕点
顺时针旋转
,当
时,求点
到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3181e58f09e9fec4e43e422b82831b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/e7598cbf-97d8-4290-9eb9-3414cbad9816.png?resizew=409)
初步感知:(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
深入探究:(2)如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f895ec9007b1dabc9d9dec9a307ed3.png)
拓展应用:(3)如图3,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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解答题-证明题
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【推荐2】如图,点B、C、E、F在同一直线上,点A、D在BC的异侧,AB=CD,BF=CE,∠B=∠C.
(2)若∠A+∠D=144°,∠C=30°,求∠AEC的度数.
(2)若∠A+∠D=144°,∠C=30°,求∠AEC的度数.
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解答题-作图题
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名校
【推荐2】在正方形
中,
是
边上的点.
(1)尺规作图:在图中求作
,使得
与
、
均相切;
保留作图痕迹,不写作法![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)在(1)的条件下,设
与
相切于点
,连接
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/63be64c8-a2db-40ef-b595-d2018ea7faf0.png?resizew=124)
(1)尺规作图:在图中求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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