已知,如图,AB是⊙O的直径,AD平分∠BAC交⊙O于点D,过点D的切线交AC的延长线于E.求证:DE⊥AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/8bff200c-5a23-4582-8742-cb2cb4818afe.png?resizew=250)
18-19九年级上·河南洛阳·期末 查看更多[15]
【市级联考】河南省洛阳市2018届九年级上学期期末考试数学试题河南省洛阳市2017-2018学年九年级(上)期末数学试卷广东省阳西县上洋中学2019届九年级上学期期末考试数学试题河北省石家庄市行唐县2019-2020学年九年级上学期期末数学试题福建省南平市浦城县2019-2020学年九年级上学期期末数学试题四川省广元市苍溪县2020-2021学年九年级上学期期末数学试题四川省广元市苍溪县2021-2022学年九年级上学期期末数学试题2022年福建省福州三牧中学九年级6月适应性练习(一模)数学试题(已下线)第9讲 直线与圆的位置关系-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(苏科版)河北省张家口市怀安县2021-2022学年九年级上学期期末数学试题山西省忻州市五台县2022-2023学年九年级上学期期中考试数学试卷(已下线)第二十九章 直线与圆的位置关系(B卷-拔高卷)-【单元测试】2022-2023学年九年级下数学分层训练AB卷【冀教版】安徽省芜湖市无为市第六中学2022-2023学年九年级上学期12月月考数学试题河南省开封市龙亭区金明中学西校区2022-2023学年九年级上学期期中数学试题福建省宁德市博雅培文学校初中部2022—2023学年九年级上学期数学期末卷
更新时间:2022-08-03 01:52:19
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【推荐2】如图,已知∠D=∠A,∠B=∠FCB,求证:∠D=∠DCF.
![](https://img.xkw.com/dksih/QBM/2019/4/29/2192767663423488/2193539078987776/STEM/6fc5edf9b556433ca689671451222a47.png?resizew=135)
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【推荐1】如图,已知
,分别探究下面三个图形中
和
,
的关系,请你从所得三个关系中任意选出一个,说明你探究结论的正确性.
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结论:(1)______________________________________;
(2)___________________________________________;
(3)____________________________________________;
选择你喜欢的任意一个结论,进行说理证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d221944148d71e2e1bc76040aefb8d.png)
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结论:(1)______________________________________;
(2)___________________________________________;
(3)____________________________________________;
选择你喜欢的任意一个结论,进行说理证明.
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解答题-证明题
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适中
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【推荐2】已知△ABC是等边三角形,点D在BC边上,点E在AB的延长线上,将DE绕D点顺时针旋转120°得到DF.
![](https://img.xkw.com/dksih/QBM/2020/1/22/2382174874009600/2382628609015809/STEM/a64c85b059994fe6b9610d4caff18334.png?resizew=532)
(1)如图1,若点F恰好落在AC边上,求证:点D是BC的中点;
(2)如图2,在(1)的条件下,若
=45°,连接AD,求证:
;
(3)如图3,若
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的值.
![](https://img.xkw.com/dksih/QBM/2020/1/22/2382174874009600/2382628609015809/STEM/a64c85b059994fe6b9610d4caff18334.png?resizew=532)
(1)如图1,若点F恰好落在AC边上,求证:点D是BC的中点;
(2)如图2,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec1ef22fd9b6f2714a2a57c9b2c50ee3.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2abe5da7ee1a2ff3ca5dec7a2d04dc.png)
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解答题-证明题
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适中
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【推荐1】如图,AB为⊙O的直径,AD为⊙O的弦,
,过点C的切线交AB的延长线于点E,连OD.
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733158114844672/2733779357728768/STEM/019cd9b46bb94d5398b756137b052154.png?resizew=179)
(1)求证:AD⊥CE;
(2)若CD=5,AB=12,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3bfee8d217cce59a9e4cce5e2bc217.png)
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733158114844672/2733779357728768/STEM/019cd9b46bb94d5398b756137b052154.png?resizew=179)
(1)求证:AD⊥CE;
(2)若CD=5,AB=12,求AD的长.
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解答题-证明题
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名校
【推荐2】如图,
内接于
,
为
的直径,
,
是
的弦,
的切线
与
的延长线交于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/6b2bed35-e854-40e2-b8ad-8423f2760ffe.png?resizew=123)
(1)求证:
;
(2)若
,垂足为
,
,求
的长.
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(1)求证:
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(2)若
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