如图,
是
的直径,弦
垂直半径
,
为垂足,
,连接
,
,过点
作
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/70c83491-8c2f-4e71-81e2-b77633983241.png?resizew=219)
(1)求证:
是
的切线;
(2)若弦
与直径
相交于点
,当
时,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea147ada4f0aefdd3808a6a1133792eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736b4224a1a0970854317fcad7c99403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/70c83491-8c2f-4e71-81e2-b77633983241.png?resizew=219)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a092c919090e3809af5871834d39874.png)
更新时间:2020-12-23 15:47:35
|
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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,已知⊙O 的直径 AB 与弦 CD 互相垂直,垂足为点 E.⊙O 的切线 BF 与弦 AC 的延长线相交于点 F,且AC=8,tan∠BDC=
.
![](https://img.xkw.com/dksih/QBM/2020/11/15/2593729264631808/2596923639005184/STEM/3df0f2de24554869a6dfcdd96b4633a2.png?resizew=159)
(1)求⊙O 的半径长;
(2)求线段 CF 长.
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![](https://img.xkw.com/dksih/QBM/2020/11/15/2593729264631808/2596923639005184/STEM/3df0f2de24554869a6dfcdd96b4633a2.png?resizew=159)
(1)求⊙O 的半径长;
(2)求线段 CF 长.
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适中
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【推荐2】如图①,两同心圆的圆心为O,大圆的弦AB与小圆相切于点P,已知两圆的半径分别为2和1.
(1)用阴影部分的扇形围成一个圆锥(OA与OB重合),求该圆锥的底面半径.
(2)用余下部分再围成一个圆锥(如图②所示),若一只小虫从A点出发,绕圆锥的侧面爬行一周后又回到A点,求小虫爬行的最短路线的长.
(1)用阴影部分的扇形围成一个圆锥(OA与OB重合),求该圆锥的底面半径.
(2)用余下部分再围成一个圆锥(如图②所示),若一只小虫从A点出发,绕圆锥的侧面爬行一周后又回到A点,求小虫爬行的最短路线的长.
![](https://img.xkw.com/dksih/QBM/2019/1/25/2126353544323072/2127693000187904/STEM/51e06f8a61034847ab3adb5f5b8416f3.png?resizew=168)
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解答题-证明题
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(0.65)
真题
【推荐1】如图,在Rt
中,
,以AC为直径的⊙O与AB边交于点D,过点D作⊙O的切线,交BC于E.
(1)求证:点E是边BC的中点;
(2)求证:
;
(3)当以点O、D、E、C为顶点的四边形是正方形时,求证:△ABC是等腰直角三角形.
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742299308032/1573742305501184/STEM/d2880753471242d0be74453459cf83f5.png)
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742299308032/1573742305501184/STEM/ba8cf3a18d8747b9868ca8e61c4f1352.png)
(1)求证:点E是边BC的中点;
(2)求证:
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742299308032/1573742305501184/STEM/13d56721c1bb4ecfae1ad9e8d19c3fe6.png)
(3)当以点O、D、E、C为顶点的四边形是正方形时,求证:△ABC是等腰直角三角形.
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742299308032/1573742305501184/STEM/b0128e3c-7148-4aff-afb5-e678bdd544de.png?resizew=187)
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名校
【推荐2】已知⊙
的半径为5,弦
的长度为
,点
是弦
所对优弧上的一动点.
![](https://img.xkw.com/dksih/QBM/2023/3/23/3200752575217664/3200949514846208/STEM/6b0848c1e6ad44e2b045cb6023c3ba1a.png?resizew=420)
(1)如图①,若
,则
的度数为_______°;
(2)如图②,若
.
①求
的正切值;
②若
为等腰三角形,求
面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2023/3/23/3200752575217664/3200949514846208/STEM/6b0848c1e6ad44e2b045cb6023c3ba1a.png?resizew=420)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7a1d739890a8951586e23b78b035bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57b1c5d4498702fd9d8354ad099043c.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,⊙O的直径
,
,
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641626565500928/2665203443589120/STEM/c13f8bc8-a6a5-4af5-b515-d0794969b7d8.png)
(1)试判断点
与⊙O的位置关系,并说明理由;
(2)过点
作
,垂足为点
,求证:直线
是⊙O的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c88add3ceb3eb4a2bbb457fcc1bc0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185ca6f97e41ecf7706d7e8c8d1c8059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e344a9a5bcf7b16fc29080f42852d428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641626565500928/2665203443589120/STEM/c13f8bc8-a6a5-4af5-b515-d0794969b7d8.png)
(1)试判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a7e5bb4d69c439f29caf2be8b5e985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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【推荐2】如图,
是
的直径,点C是
上一点,
平分
交
于点D,过点D作
交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/fda45be0-bfed-444a-86da-34ab1c8b712b.png?resizew=129)
(1)求证:直线
是
的切线;
(2)延长
与直线
交于点F,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/fda45be0-bfed-444a-86da-34ab1c8b712b.png?resizew=129)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44139397ca74742986ccf5de466c4d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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