如图:已知∠B=∠E=90°,点B、C、F、E在一条直线上AC=DF,BF=EC.求证四边形ACDF是平行四边形.
![](https://img.xkw.com/dksih/QBM/2020/9/15/2550068479827968/2551740070232064/STEM/342e2370f82c4633af7fad0728521a44.png?resizew=132)
18-19八年级下·河南平顶山·期末 查看更多[3]
更新时间:2020-09-17 15:11:22
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解答题-问答题
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【推荐1】已知:如图,四边形ABCD中,AD∥BC,∠B=90°,AD=AB=4,BC=7,点E在BC上,将△CDE沿DE折叠,点C恰好落在AB边上的点F处.
(1)求线段DC的长度;
(2)求△FED的面积.
(1)求线段DC的长度;
(2)求△FED的面积.
![](https://img.xkw.com/dksih/QBM/2020/3/22/2424598015393792/2425247789113344/STEM/6903c1aa9411411db190086e72dd5083.png?resizew=163)
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解答题-证明题
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【推荐2】如图,在
中,
,
平分
,交
于点
,过点
作
于点
.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6a978e0e798846fee4e8daba0c6fbc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/24/9504d56c-58bc-4581-a41f-d77e0687369d.png?resizew=162)
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解答题-证明题
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【推荐1】如图,已知在梯形
中,
,
,
,
是
边的中点,
、
相交于点
.
是平行四边形;
(2)设边
的中点为
,连接
.求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ee81b6066188abee9d167b6c7f3f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bfad3f7e65188bcf7f62ea5acdbf4a.png)
(2)设边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ae1f46c31dbb27b267724b6eaad65e.png)
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解答题-作图题
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【推荐2】按要求画出图形:
的正方形网格中,每个小方格的顶点叫做格点,按下列要求在网格中画出图形:
在图1中,以格点为顶点画一个面积为8的正方形;
在图2中,以格点为顶点画一个三角形,使三角形三边长分别为4、
、
;
请你判断这个三角形 直角三角形(填“是”或“不是”).
(2)如图3,已知点
,B为第二象限内的一个整点(即横纵坐标都为整数的点),且
.
①直接写出点B的坐标为 ;
②画出以A、B、O及合适的第四个点C为顶点的所有平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
在图1中,以格点为顶点画一个面积为8的正方形;
在图2中,以格点为顶点画一个三角形,使三角形三边长分别为4、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
请你判断这个三角形 直角三角形(填“是”或“不是”).
(2)如图3,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3bbe39cdc293f56388da62ad0a9c7ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
①直接写出点B的坐标为 ;
②画出以A、B、O及合适的第四个点C为顶点的所有平行四边形.
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