如图,在△ABC中,AB=BC,以AB为直径的⊙O与AC交于点D,过D作⊙O的切线交AB的延长线于E,交BC于F.
(1)求证:DF⊥BC;
(2)求证:DE2=AE•BE.
(1)求证:DF⊥BC;
(2)求证:DE2=AE•BE.
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669684645478400/2671218928771072/STEM/7aeddfd6a855477f94e1aed6cb08bda6.png?resizew=198)
20-21九年级上·安徽阜阳·期末 查看更多[5]
安徽省阜阳市太和县2020-2021学年九年级上学期期末数学试题2021年山东省德州市乐陵市九年级第二次模拟检测数学试题2021年山东省德州市乐陵市中考数学二模试题2023年山东省济南市长清区(东片区)中考一模数学试题 (已下线)专题12 切线的证明与计算-学易金卷:2023年中考数学一模试题分项汇编(山东专用)
更新时间:2021-03-05 10:31:44
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解答题-问答题
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适中
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【推荐1】如图,点O是△ABC的边AB上一点,⊙O与边AC相切于点E,与边BC、AB分别相交于点D、F,且DE=EF,若BC=3,
时,求AF的长.
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的直径,经过
上一点
,作
的切线
,交
的延长线于点
,
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/83a1a70f-ba34-42cd-83e4-17576281c950.png?resizew=173)
(1)求证:
.
(2)若
的半径为3,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)求证:
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(2)若
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解答题-作图题
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适中
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【推荐1】已知线段
.
的垂直平分线
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于点O(保留作图痕迹,不写作法);
(2)在(1)基础上,在
上截取
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①判断四边形
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解答题-问答题
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