如图,AB为⊙O的直径,⊙O过AC的中点D,DE为⊙O的切线.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860155341832192/2864560707723264/STEM/53ac4856-0a2a-423f-9168-fe8f6ee47551.png?resizew=202)
(1)求证:DE⊥BC;
(2)如果DE=2,tanC=
,求⊙O的直径.
![](https://img.xkw.com/dksih/QBM/2021/11/27/2860155341832192/2864560707723264/STEM/53ac4856-0a2a-423f-9168-fe8f6ee47551.png?resizew=202)
(1)求证:DE⊥BC;
(2)如果DE=2,tanC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
20-21九年级上·北京·单元测试 查看更多[3]
(已下线)第二十一、二十二章 圆(能力提升)-2020-2021学年京改版九年级数学上册单元测试卷安徽省六安市金安区汇文中学2021-2022学年九年级上学期素质评估数学试题(已下线)第15讲 锐角三角函数及相关概念(6大考点)-2022-2023学年九年级数学考试满分全攻略(人教版)
更新时间:2021-12-03 14:26:35
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
为
的直径,E为
的延长线上一点,过点E作
的切线,切点为点C,连接
,
,过点A作
交延长线于点D.
.
(2)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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0aaa5cf7dafac1b64eafe84cae5674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94de30a9ba84c099323e91ddbab9798a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,
为
的直径,C、D为
上两点,过点C作
的切线
交
的延长线于点F,连接
并延长交
于点E,且
.
;
(2)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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba328ff41a09e6ffd14436a78c8e7bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc51e09a430b82735346d54d6dd95a2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd90bfa2987b84df430498021d5f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e15d4a3a76385eb3e1f28912fcf664c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,点B在线段AF上,分别以AB、BF为边在线段AF的同侧作正方形ABCD和正方形BFGE,连接CF和DE,CF交EG于点H.
(1)若E是BC的中点,求证:DE=CF;
(2)若∠CDE=30°,求
的值.
![](https://img.xkw.com/dksih/QBM/2017/8/18/1754556183986176/1756765394501632/STEM/2824aa51eb2c460fa9f3c28ce38d81bd.png?resizew=166)
(1)若E是BC的中点,求证:DE=CF;
(2)若∠CDE=30°,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3da9c154c562bdcc6263fe3e07ffc1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/18/1754556183986176/1756765394501632/STEM/2824aa51eb2c460fa9f3c28ce38d81bd.png?resizew=166)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:在
中,
是直径,
是
的切线,连接
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/db6cdfa1-b99c-4f9e-9ad4-bc8ff0d37b75.png?resizew=128)
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/db6cdfa1-b99c-4f9e-9ad4-bc8ff0d37b75.png?resizew=128)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ca89f4d99de45f14f0e3f753c0414b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5409274e875da6956c60a7ffefdf8272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次