已知,在△ABC中,AB=AC,点D在AC上,点E为CD中点,以点E为圆心,CE为半径的圆交BC与点F,连结AF交⊙E与点G,连结BG,EF,∠BGF=∠BAC.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/6ceb92f5-e5fd-4599-b193-f312c31afc27.png?resizew=143)
(1)AB
EF.
(2)△ABG∽△FAE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/6ceb92f5-e5fd-4599-b193-f312c31afc27.png?resizew=143)
(1)AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)△ABG∽△FAE.
20-21九年级上·浙江金华·期中 查看更多[4]
浙江省金华市义乌市廿三里初级中学大陈等五校2020-2021学年 九年级上学期期中联考数学试题浙江省金华市义乌市义乌市廿三里初级中学2020-2021学年九年级上学期联考月考数学试题(已下线)第09讲 探索三角形相似的条件-【帮课堂】2022-2023学年九年级数学下册同步精品讲义(苏科版)(已下线)2022年浙江省杭州市滨江区中考二模数学试题变式题21-23
更新时间:2022-09-23 12:34:20
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【推荐1】如图,点B、D、E在一条直线上,BE与AC相交于点F,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/8cd3d289-fb2b-41d3-8d15-14143cd223aa.png?resizew=223)
(1)求证:
;
(2)若
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(3)连接
,若
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d352f7a6f8362993b4eb8ee8de02f9.png)
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(1)求证:
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(2)若
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(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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【推荐2】某同学在研究传统文化“抖空竹”时有一个发现:他把它抽象成数学问题,如图所示,已知
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真题
名校
【推荐1】如图,四边形
为菱形,点E在
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.
;
(2)当
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名校
【推荐2】新定义:如图1和图2中,点P是平面内一点,如果
或
,称点P是线段
的友好点.
(1)如图3,
中,
,
,问:点F是否是线段
的友好点?请说明理由.
(2)如图4,
中,
,F是线段
的友好点
,
是
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上的友好点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172dc6582e149aaef31b4ddb7953c6c2.png)
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(1)如图3,
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【推荐1】如图①,
的半径为
,若点
在射线
上,满足
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的“反演点”.如图②,
的半径为4,点
在
上,∠BOA=60°,
,若点
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分别是点
、
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的反演点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
,
,
,
分别为
上一点,连
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,
,
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;
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【推荐1】如图,在矩形ABEF中,四边形ABCH、四边形CDGH和四边形DEFG都是正方形,图中的△ACD与△ECA相似吗?请说明理由.
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