我们定义对角线互相垂直的四边形叫做垂美四边形.
如图点E是四边形ABCD内一点,已知BE=EC,AE=ED,∠BEC=∠AED=90°,对角线AC与BD交于O点,BD与EC交于点F,AC与ED交于点G.
(1)求证:四边形ABCD是垂美四边形;
(2)猜想四边形ABCD两组对边AB、CD与BC、AD之间的数量关系并说明理由;
(3)若BE=3,AE=4,AB=6,则CD的长为 .
如图点E是四边形ABCD内一点,已知BE=EC,AE=ED,∠BEC=∠AED=90°,对角线AC与BD交于O点,BD与EC交于点F,AC与ED交于点G.
(1)求证:四边形ABCD是垂美四边形;
(2)猜想四边形ABCD两组对边AB、CD与BC、AD之间的数量关系并说明理由;
(3)若BE=3,AE=4,AB=6,则CD的长为 .
![](https://img.xkw.com/dksih/QBM/2021/11/23/2857278137016320/2859080816287744/STEM/05595069-e541-4e83-8c83-a646515c2cba.png)
21-22八年级上·辽宁沈阳·期中 查看更多[3]
辽宁省沈阳市苏家屯区2021-2022学年八年级上学期期中数学试题(已下线)期中考前必刷卷-【单元测试】2022-2023学年八年级数学上册分层训练AB卷(北师大版)【测试范围:第一章、第二章、第三章、第四章、第五章】辽宁省丹东市凤城市2022-2023学年八年级上学期期中数学试题
更新时间:2021-11-25 20:37:43
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解答题-证明题
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【推荐1】四边形ABCD是正方形,E在DC上、F在CB的延长线上,且
,连接AE、AF、EF.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2968005046108160/3041598389633024/STEM/e01b6f4afb8d405e8462968b0b7a402c.png?resizew=173)
(1)求证:
≌
;
(2)填空:
可以由
绕旋转中心______点,按顺时针方向旋转______度得到;
(3)判定
的形状,若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2968005046108160/3041598389633024/STEM/e01b6f4afb8d405e8462968b0b7a402c.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
(2)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)判定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】数学活动:探究利用角的对称性构造全等三角形解决问题,利用角平分线构造“全等模型”解决问题,事半功倍.
(1)尺规作图:如图①,用直尺和圆规作已知角的平分线的示意图,说明
的依据是
,这两个三角形全等的判定条件是______.
【问题探究】
(2)①巧翻折,造全等
如图②,在
中,
是
的角平分线,请说明
.
小明在
上截取
.连接DE,则
.请继续完成小明的解答;
②构距离,造全等
如图③,在四边形ABCD中,
,
,
和
的平分线
,
交
于点
.过点
作
于点
.若
,求点
到
的距离;
【问题解决】
(3)如图④,在
中,
,
,
是
的两条角平分线,且
,
交于点
.请判断
与
之间的数量关系,并说明理由.
(1)尺规作图:如图①,用直尺和圆规作已知角的平分线的示意图,说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765cc72696ba18bde732cda1a7512057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a3de8d77f74b1b760702b31cefa07c.png)
【问题探究】
(2)①巧翻折,造全等
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c01304349206ca6ea08dfaa88c5ba0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab74bb80fd9af8c46c88b7eb82a0976.png)
小明在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a83c6b818e589628debb1d20d71f46d.png)
②构距离,造全等
如图③,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95efaa2bb4dce0f63f4a23e0f29c5aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【问题解决】
(3)如图④,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
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【推荐1】如图,在平面直角坐标系中,直线
的解析式为
,点
的坐标分别为(1,0),(0,2),直线
与直线
相交于点
.
(1)求直线
的解析式;
(2)点
在第一象限的直线
上,连接
,且
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694033aa4e20853cf10f33c870007047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/f1bbde32-1edb-4983-95da-500341355695.png?resizew=142)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】一个长方形的长与宽的比是5:3,它的对角线长为
cm,求这个长方形的长与宽(结果保留一位小数).
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