1 . 如图,在 Rt△ABC 中,∠C=90°,AD 平分∠BAC 交 BC 于点 D,O 为 AB 上一点,经过点 A、D 的⊙O 分别交 AB、AC 于点 E、F,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/fb509cd6-f562-4e2d-8f42-2b79579d2d22.png?resizew=138)
(1)求证:BC 是⊙O 切线;
(2)设 AB=m,AF=n,试用含 m、n 的代数式表示线段 AD 的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/fb509cd6-f562-4e2d-8f42-2b79579d2d22.png?resizew=138)
(1)求证:BC 是⊙O 切线;
(2)设 AB=m,AF=n,试用含 m、n 的代数式表示线段 AD 的长.
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2 . 如图所示,在
中,
,若
,
,则
的值为()
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/2f6b3fbb-46a4-45f3-b08c-03f457d93700.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262e062dcdd2039084a356862b123e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc72224e1a6bcf72472a4ed17ce8cb0f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/2f6b3fbb-46a4-45f3-b08c-03f457d93700.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-03-07更新
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2卷引用:云南省大理白族自治州2022-2023学年九年级上学期期末数学试题
名校
3 . 如图,反比例函数y=
的图象上有一动点A,连接AO并延长交图象的另一支于点B,在第二象限内有一点C,满足AC=BC,当点A运动时,点C始终在函数y=
的图象上运动,tan∠CAB=2,则k=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c943d7b6ce65c70e98d62e3664168ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/14/7d89863e-9faf-4f65-b52e-40ad09ad0902.png?resizew=175)
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2020-03-03更新
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2卷引用:云南省昆明市昆明市第二中学2021-2022学年九年级上学期期末数学试题
2019·云南·一模
名校
4 . 如图,
,
与
相交于点O,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2783acb59d90b112a4448c605a387962.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9738337a8dfcd07079fe1e6d1011c08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ac56d3bbee87f77ac2feda8b60b31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2783acb59d90b112a4448c605a387962.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394085772902400/2394441944621056/STEM/021c8f2dfbf44c248695145ac11ace84.png?resizew=126)
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5 . 如图,正方形ABCD中,AB=2,E为BC中点,过点E作EF⊥AE交CD于F,则CF的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/27/065d6459-000b-4173-80b1-5b6e504b31e7.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/27/065d6459-000b-4173-80b1-5b6e504b31e7.png?resizew=135)
A.![]() | B.![]() | C.1 | D.2 |
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2020-01-22更新
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2卷引用:云南省楚雄彝族自治州楚雄市楚雄天人初级中学2023-2024学年九年级上学期期末数学试题
6 . 如图,⊙O是△ABC的外接圆,AB为直径,∠BAC的平分线交⊙O于点D,过点D作DE⊥AC分别交AC的延长线于点E,交AB的延长线于点F.
(1)求证:EF是⊙O的切线;
(2)若AC=8,CE=4,求弧BD的长.(结果保留π)
(1)求证:EF是⊙O的切线;
(2)若AC=8,CE=4,求弧BD的长.(结果保留π)
![](https://img.xkw.com/dksih/QBM/2020/1/20/2380921712713728/2381286995525632/STEM/24658528c9f44ef9a41a5e8ad10d27b2.png?resizew=160)
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4卷引用:云南省昆明市官渡区2019-2020学年九年级上学期期末数学试题
7 . 如图,
是正三角形,D、E分别是BC、AC 上的点,当
=_______ 时,
~
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://img.xkw.com/dksih/QBM/2020/1/16/2377957723955200/2378457322872833/STEM/7b1dd92d-264c-40c2-a23b-03256850abaa.png)
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4卷引用:云南省文山壮族苗族自治州文山市第二学区2023-2024学年九年级上学期期末数学试题
云南省文山壮族苗族自治州文山市第二学区2023-2024学年九年级上学期期末数学试题广东省佛山市南海区2019-2020学年九年级上学期期末数学试题(已下线)第11课时 相似三角形的判定(基础练)-2020-2021学年九年级数学上册十分钟同步课堂专练(华师大版)(已下线)专题09探索三角形相似的条件(7个知识点6种题型)-【帮课堂】2023-2024学年九年级数学下册同步学与练(苏科版)
8 . 如图,在
中,
是
边上一点,
的平分线交
于点
,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4110df3e22a024c2179b6b73b628d6e6.png)
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373210793099264/2373445525241856/STEM/02e8bc5874424be7889a0bdbeb19fc9a.png?resizew=218)
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9 . 如图,在边长为6的菱形
中,
与
的延长线相交于点
,与
相交于点
.若
,则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373210793099264/2373445524914176/STEM/1d6d2e5b4c5d472cac3f48a5b72464d3.png?resizew=188)
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10 . 如图,AB是⊙O的直径,点C、D在圆上,
=
,过点C作CE⊥AD延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/ea71d455-7206-4970-af23-0e9e3bafbbe6.png?resizew=121)
(1)求证:CE是⊙O的切线;
(2)若BC=3,AC=4,求CE和AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/ea71d455-7206-4970-af23-0e9e3bafbbe6.png?resizew=121)
(1)求证:CE是⊙O的切线;
(2)若BC=3,AC=4,求CE和AD的长.
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2019-11-24更新
|
539次组卷
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3卷引用:云南省昆明市第八中学2020-2021学年九年级上学期期末数学试题