如图,在平行四边形ABCD中,AE平分∠BAD交BC于点E.
(1)作CF平分∠BCD交AD于点F(用尺规作图,保留作图痕迹,不要求写作法);
(2)在(1)的条件下,求证:△ABE≌△CDF.
(1)作CF平分∠BCD交AD于点F(用尺规作图,保留作图痕迹,不要求写作法);
(2)在(1)的条件下,求证:△ABE≌△CDF.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/74c5fa5d-2b5b-484c-9a80-5ab2786f8b12.png?resizew=170)
更新时间:2018-08-14 21:52:12
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解答题-问答题
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【推荐1】已知如图,在△ABC中,D是BC的中点.过点D的直线GF交AC于点F,交AC的平行线BG于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/c49fda55-1d5b-407e-8d82-3b5b89974705.png?resizew=182)
(1)试说明BG=CF.
(2)若DE⊥GF交AB于点E,连接EF,试判断BE+CF与EF之间的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/c49fda55-1d5b-407e-8d82-3b5b89974705.png?resizew=182)
(1)试说明BG=CF.
(2)若DE⊥GF交AB于点E,连接EF,试判断BE+CF与EF之间的大小关系,并说明理由.
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【推荐2】如图,已知:AC=BC,AC⊥BC,AE⊥CF,BF⊥CF,C、E、F分别为垂足, 且∠BCF=∠ABF,CF交AB于D.
(1)判断△BCF≌△CAE,并说明理由.
(2)判断△ADC是不是等腰三角形?并说明理由.
(1)判断△BCF≌△CAE,并说明理由.
(2)判断△ADC是不是等腰三角形?并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/dcdee96c-3b74-4732-9f6e-0cadffefb9eb.png?resizew=197)
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解答题-作图题
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【推荐1】尺规作图:(只保留作图痕迹,不要求写出作法)
如图,已知
,且
,
是
的外角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/1/12829c27-c671-4652-bc7c-2a878adfb618.png?resizew=121)
(1)在
边上求作点
,使
;
(2)作
的平分线
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/1/12829c27-c671-4652-bc7c-2a878adfb618.png?resizew=121)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
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解答题-作图题
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【推荐2】尺规作图(不写作法,保留作图痕迹)
(1)在图1中,以射线
为边,请用尺规作图在射线
上方作
;
(2)在图2中,请用尺规作图作
点关于直线
的对称点
;
(3)解决实际问题:如图3,不平行的公路
,
(均为直线)分别经过
两个加油站,现准备建一个油库,要求油库的位置点
满足到
两个加油站的距离相等,而且点
到两条公路
,
的距离也相等,请用尺规作图作出点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/cf661dea-eef0-49ee-bc67-f9788d7da341.png?resizew=550)
(1)在图1中,以射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc33578e63c1d524857b84a290fa71c0.png)
(2)在图2中,请用尺规作图作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(3)解决实际问题:如图3,不平行的公路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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【推荐1】如图,在平行四边形ABCD中,连接对角线AC,延长AB至E,使BE=AB,连接DE,分别交BC,AC于点F,G.
![](https://img.xkw.com/dksih/QBM/2022/3/17/2938128530423808/2942064958955520/STEM/081b0234b87441f7862de55a46926daa.png?resizew=203)
(1)求证:BF=CF;
(2)若BC=6,DG=4,求FG的长;
(3)若△FCG面积为1,则四边形ABFG面积为多少?
![](https://img.xkw.com/dksih/QBM/2022/3/17/2938128530423808/2942064958955520/STEM/081b0234b87441f7862de55a46926daa.png?resizew=203)
(1)求证:BF=CF;
(2)若BC=6,DG=4,求FG的长;
(3)若△FCG面积为1,则四边形ABFG面积为多少?
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解答题-证明题
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【推荐2】如图,在平行四边形
中,点E在边
上,点F在边
的延长线上,连接
、
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/fc77c50c-611c-4e2c-92ba-232256131e73.png?resizew=182)
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