如图,
是
的直径,弦
交直径
于点E,过点A作
的切线交弦
的延长线于点F,点D为
的中点.
.
(2)作半径
,若
,
,求
的值.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438fe61c5d141d76d887b6fc2e8aaa7.png)
(2)作半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b08668b77628265eaa98a3cee1338dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e33271fd34b4c061d780f42195f744b0.png)
更新时间:2024-04-21 10:23:45
|
相似题推荐
解答题-证明题
|
适中
(0.65)
真题
名校
【推荐1】如图,⊙
是
的外接圆,AB是⊙
的直径,点D在⊙
上,
,连接AD,延长DB交过点C的切线于点E.
;
(2)求证:
;
(3)若
,求DB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d61f97529ed6945c4fa6219867189a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbc67735e4e22a62cd3f3984e730287.png)
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【推荐2】请阅读下面材料,并完成相应的任务;
阿基米德折弦定理
阿基米德(Arehimedes,公元前287—公元前212年,古希腊)是有史以来最伟大的数学家之一,他与牛顿、高斯并称为三大数学王子.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893758724227072/2895875997196288/STEM/a264d6e6-76a0-4d90-aa27-648adc61fa01.png?resizew=113)
阿拉伯Al-Biruni(973年—1050年)的译文中保存了阿基米德折弦定理的内容,苏联在1964年根据Al-Biruni译本出版了俄文版《阿基米德全集》,第一题就是阿基米德的折弦定理.
阿基米德折弦定理:如图1,AB和BC是
的两条弦(即折线ABC是圆的一条折弦),
,M是
的中点,则从点M向BC所作垂线的垂足D是折弦ABC的中点,即
.
这个定理有很多证明方法,下面是运用“垂线法”证明
的部分证明过程.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893758724227072/2895875997196288/STEM/d7a36e53-0881-4d4c-acb9-a1b3a682aac5.png?resizew=292)
证明:如图2,过点M作
射线AB,垂足为点H,连接MA,MB,MC.
∵M是
的中点,
∴
.
…
任务:
(1)请按照上面的证明思路,写出该证明的剩余部分;
(2)如图3,已知等边三角形ABC内接于
,D为
上一点,
,
于点E,
,连接AD,则
的周长是______.
阿基米德折弦定理
阿基米德(Arehimedes,公元前287—公元前212年,古希腊)是有史以来最伟大的数学家之一,他与牛顿、高斯并称为三大数学王子.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893758724227072/2895875997196288/STEM/a264d6e6-76a0-4d90-aa27-648adc61fa01.png?resizew=113)
阿拉伯Al-Biruni(973年—1050年)的译文中保存了阿基米德折弦定理的内容,苏联在1964年根据Al-Biruni译本出版了俄文版《阿基米德全集》,第一题就是阿基米德的折弦定理.
阿基米德折弦定理:如图1,AB和BC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c4e3cf5aa65a81a357c97a6b7ee5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
这个定理有很多证明方法,下面是运用“垂线法”证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893758724227072/2895875997196288/STEM/d7a36e53-0881-4d4c-acb9-a1b3a682aac5.png?resizew=292)
证明:如图2,过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a984e08781547575be9680e8c61bb21.png)
∵M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048bb40304b45c5be0b98de9183e4292.png)
…
任务:
(1)请按照上面的证明思路,写出该证明的剩余部分;
(2)如图3,已知等边三角形ABC内接于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ce31792e3b730d7eedeaf1103f6973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893758724227072/2895875997196288/STEM/0c50d327-27d1-4da4-8529-177ada48622d.png?resizew=111)
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【推荐1】如图,
为
的直径,
为
上一点,
于点
,
为
延长线上一点,
.
为
的切线;
(2)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9374256e86039773fb7437d9998d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d10f2db7289ff1ec65c47d9af77a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7ea812765f32a4ff67afd6bfaeaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,
是
的切线,
点在
上,
与
相交于
,
是
的直径,连接
,若
.
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899422377459712/2901264953278464/STEM/1ad508c2-2eb0-4ae2-8cfd-882d7733fd0c.png?resizew=137)
(1)求证:
平分
;
(2)当
,
时,求
的半径长.
![](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/8455657dde27aabe6adb7b188e031c11.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899422377459712/2901264953278464/STEM/1ad508c2-2eb0-4ae2-8cfd-882d7733fd0c.png?resizew=137)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(0.65)
【推荐1】如图,在
岛周围
海里水域内有暗礁,一轮船由西向东航行到
处时,测得
岛在北偏东
的方向,且与轮船相距
海里.若该船继续保持由西向东的航行,那么有触礁的危险吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48de9da1b7fca16b44d9f6ee454a6c77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/cf356b5b-612a-4766-979a-6dd045bd5b27.png?resizew=191)
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【推荐2】已知:如图,在Rt△ABC中,∠ACB=90°,BC=12,cosB=
,D、E分别是AB、BC边上的中点,AE与CD相交于点G.
(1)求CG的长;
(2)求tan∠BAE的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)求CG的长;
(2)求tan∠BAE的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/117361f8-1bb2-4a51-b0e3-b9a1d7b63d0a.png?resizew=194)
您最近一年使用:0次