如图,已知AB
CD,AB=CD,BE=CF.求证:AF
DE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/5/2887713242374144/2887795999997952/STEM/a3abca1d-682f-4aaf-810c-2c65457e20ce.png?resizew=143)
18-19七年级上·重庆北碚·期末 查看更多[8]
更新时间:2022-01-05 10:18:54
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【推荐2】将一幅三角板拼成如图所示的图形,过点C作CF平分∠DCE交DE于点F,
(2)求∠DFC的度数.
(2)求∠DFC的度数.
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【推荐1】如图,△ABC中,AD是BC边的中线,E是AD的中点,过点A作BC的平行线交BE的延长线于F,连结CF.
(1)求证:四边形ADCF是平行四边形;
(2)当△ABC满足什么条件时,四边形ADCF是菱形;
(3)当△ABC满足什么条件时,四边形ADCF是正方形.
注:(2)、(3)小题直接填写条件,不需要写出理由.
(1)求证:四边形ADCF是平行四边形;
(2)当△ABC满足什么条件时,四边形ADCF是菱形;
(3)当△ABC满足什么条件时,四边形ADCF是正方形.
注:(2)、(3)小题直接填写条件,不需要写出理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/a68b4c1d-5aec-455b-ba14-7d1265bdf3ce.png?resizew=165)
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【推荐2】如图,在
中,
,
是通过如图的作图痕迹作图而得,
,交
于点E.
.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0487ebca22d4aa1233073f81fd70a424.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf582f8530ecc0e6a97bda8f89c8243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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【推荐1】如图,点B、F、C、E在同一条直线上,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d891b76e7d2496091aa6d34b0dc1237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7e29856f61925521f052fb2b2103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://img.xkw.com/dksih/QBM/2022/12/31/3142689026260992/3162006917177344/STEM/8594dbe2de16444b9d600fa126016afb.png?resizew=191)
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【推荐2】如图,
是
的高,E是
上一点,
交
于F,且有
,
,试说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a1d4c140243ba9a9bd7256ec2bbce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e94399c4924cf2a862737a2825fe4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/3f4ecfc4-f8e4-4505-b53e-363d86265215.png?resizew=132)
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