如图,在平行四边形ABCD中,过点D作DE⊥AB于点E,点F在边CD上,DF=BE,连接AF,BF.
(1)求证:四边形BFDE是矩形;
(2)若AF平分∠DAB,CF=3,BF=4,求DF长.
(1)求证:四边形BFDE是矩形;
(2)若AF平分∠DAB,CF=3,BF=4,求DF长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/b356710f-c645-4319-9c69-b25347cc8026.png?resizew=193)
2018·江苏扬州·二模 查看更多[15]
【全国区级联考】江苏省邗江区2018届九年级第二次模拟考试数学试题北师大版九年级上第一章 A学区 第2节 矩形的性质与判定(二)北京市门头沟区2020-2021学年八年级下学期期末数学试题湖南省长沙市雨花区雅礼实验中学2021-2022学年九年级上学期开学考试数学试题北京市第五十五中学2020-2021学年九年级上学期10月月考数学试题(已下线)第02课 矩形的性质与判定-2022-2023学年九年级数学上册课后培优分级练(北师大版)(已下线)18.2.1 矩形(含2个课时)(练习)-2022-2023学年八年级数学下册同步精品课堂(人教版)(已下线)专练01 矩形解答证明题(练习)-2022-2023学年八年级数学下册同步精品课堂(人教版)(已下线)9.4 矩形、菱形、正方形(第1课时,矩形)(练习)-2022-2023学年八年级数学下册同步精品课堂(苏科版)北京市朝阳区陈经纶劲松分校2022~2023学年八年级下学期3月月考数学试卷北京市汇文中学2022-2023学年八年级下学期期中数学试题河南省郑州市郑州高新技术产业开发区郑州枫杨外国语学校2023-2024年九年级上学期第二次月考数学试题北京市日坛中学2023--2024学年八年级下学期期中数学试题北京市大峪中学分校2023-2024学年八年级下学期期中数学试题2024年山东省日照市莒县中考二模数学试题
更新时间:2021-09-12 20:24:18
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【推荐1】如图,
,点
在
上,过点
作
的平行线交
于点
,交过点
的直线于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/d0a15172-48e2-4e76-a639-de8782fc8011.png?resizew=129)
(1)求证:
是
的切线;
(2)若
,求
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cf954378eca1e0383020c48bbf905c.png)
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【推荐2】水乡建湖小桥多.桥的结构多为弧形的桥拱,弧形桥拱和平静的水面构成了一个美丽的弓形(图①).我校数学兴趣小组同学研究如何测量圆弧形拱桥中桥拱圆弧所在圆的半径问题,将桥拱记为弧
,弦
为水平面,设弧
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处的仰角为
,
,则
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的代数式表示)
(2)如图③,在实地勘测某座拱桥后,同学们记录了下列数据:
,
米,求半径
(结果精确到
).(参考数据:
)
(3)如图④,在弧
上任取一点
(不与
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于点D,若
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(2)如图③,在实地勘测某座拱桥后,同学们记录了下列数据:
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(3)如图④,在弧
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【推荐1】如图,已知AC∥DE且AC=DE,AD,CE交于点B,AF,DG分别是△ABC,△BDE的中线,求证:四边形AGDF是平行四边形.
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【推荐2】E,F是四边形
的对角线
上两点,
,
,
.求证:四边形
是平行四边形.
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【推荐1】如图所示,小亮在大楼
的观光电梯中的
点测得大楼
楼底
点的俯角为60°,此时他距地面的高度
为21米,电梯再上升9米到达
点,此时测得大楼
楼顶
点的仰角为45°,求大楼
的高度.(结果保留根号)
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【推荐2】如图,
是
的直径,点
是
上一点,连接
,
,
是
的切线,点
是
上一点,过点
作
于点
,交
于点
,交
于点
.
与点
重合时,已知
,求
的度数;
(2)如图2,连接
,
,当
时,
与
交于点
,已知
,
,求
的长.
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(2)如图2,连接
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