如图,在△ABC中,∠ACB=90°,将△ABC沿BC方向平移,得到△DEF.
(1)写出由条件“△ABC沿BC方向平移,得到△DEF”直接得到的两个结论,且至少有一个结论是线段间的关系;
(2)判断四边形ACFD的形状,并证明.
(1)写出由条件“△ABC沿BC方向平移,得到△DEF”直接得到的两个结论,且至少有一个结论是线段间的关系;
(2)判断四边形ACFD的形状,并证明.
![](https://img.xkw.com/dksih/QBM/2021/1/11/2633926803554304/2639317451759616/STEM/4d43108171244c0e806dd13c07083393.png?resizew=166)
19-20八年级下·云南玉溪·期中 查看更多[2]
更新时间:2021-01-19 08:48:00
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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,E是AD的中点,连接CE并延长,与BA的延长线交于点F.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992569730883584/2994148397735936/STEM/76bbe57c-db6a-48ae-af42-6b99de7df7d8.png?resizew=306)
(1)求证EF=EC;
(2)连接AC,DF,若AC平分∠FCB,求证:四边形ACDF为矩形.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992569730883584/2994148397735936/STEM/76bbe57c-db6a-48ae-af42-6b99de7df7d8.png?resizew=306)
(1)求证EF=EC;
(2)连接AC,DF,若AC平分∠FCB,求证:四边形ACDF为矩形.
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【推荐2】如图,
、
分别是
的对边
、
的中点,且
,连结
、
、
、
,交点分别为点
、
.请判断四边形
是什么特殊四边形.并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99393efa04579f3db5cf4f7e319f0440.png)
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解答题-作图题
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【推荐3】在学习平行四边形后,小函进行了拓展性研究,她发现,平行四边形
中,在
边上截
,连接
,作
的角平分线交
于点E,则
.她的解决思路是通过证明两条线段所在的四边形是平行四边形得出结论.请根据她的思路完成以下作图和填空;
(1)用直尺和圆规,在
边上截
,连接
,作
的角平分线
,交
于点E(只保留作图痕迹).
(2)已知:如图,四边形
是平行四边形,
,
平分
,交
于点E.求证:
.
是平行四边形,
∴
,
,
,
∴
___①___,
∵
平分
,
∴
___②___,
∴
,
∴
,
∵
,
∴
___③___,
∴
___④___,
∴
,
∴四边形
是平行四边形(___⑤___),
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa8a9b14da8a472a8855449f1160b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
(1)用直尺和圆规,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa8a9b14da8a472a8855449f1160b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)已知:如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3cd8fbcd9eb594adb8367795d444d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ec5a6d46df6c070e239ae6d642a54.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ec5a6d46df6c070e239ae6d642a54.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf66a8aca6cff908cb939b5a4e564.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95adbf026e5ad4ce6f123e5e0b89da7d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/189d4911005c20ea6d155bb7a9d28a96.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c931bbba4e02a2ad4584311896738f33.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
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解答题-问答题
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【推荐1】如图,
是
的两条直径.
(1)判断四边形
的形状,并说明理由.
(2)若
的直径为8,
,求四边形
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2d3ea3bdfca7111b823bb1c381a0f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/14a79341-2ecb-435f-8dea-467afb52680f.png?resizew=140)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
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【推荐2】如图,已知菱形ABCD,AB=AC,E、F分别是BC、AD的中点,连接AE、CF.
(1)证明:四边形AECF是矩形;
(2)若AB=8,求菱形的面积.
(1)证明:四边形AECF是矩形;
(2)若AB=8,求菱形的面积.
![](https://img.xkw.com/dksih/QBM/2021/6/9/2739387511259136/2801537313308672/STEM/53de049f-f890-4745-94c4-d4ac6aa702d4.png?resizew=270)
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解答题-作图题
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【推荐1】如图,在每个小正方形边长为1的方格纸中,
的顶点都在方格纸格点上.
(1)将
向左平移2格,请在图中画出平移后的△
;
(2)将
向上平移4格,请在图中画出平移后的△
;
(3)△
的面积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1654f0789bb0af158a712fcdb8ca865.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8f3adf63ad8d0a27105ff1096138dd.png)
(3)△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8f3adf63ad8d0a27105ff1096138dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/22/30ac5687-4bbb-4d0f-b426-d585cabfc53a.png?resizew=183)
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解答题-作图题
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【推荐2】如图,在平面直角坐标系中,△ABC的三个顶点的坐标分别为A(−2,5),B(−4,3),C(−1,1).
(1)作出△ABC向右平移5个单位后所得到的△A1B1C1;
(2)作出△ABC关于x轴对称的△A2B2C2,并写出点C2的坐标.
(1)作出△ABC向右平移5个单位后所得到的△A1B1C1;
(2)作出△ABC关于x轴对称的△A2B2C2,并写出点C2的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/d8c885f8-5772-4ba8-bb26-caca996fbec9.png?resizew=272)
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