题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025958-91672.png)
(Ⅰ)求AM的长;
(Ⅱ)求sin∠ANC.
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025958-94070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-76145.png)
解析
试题分析:本题主要以圆为几何背景考查切线的性质以及求边长求角,可以运用平行四边形的知识证平行和相等.第一问,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-91151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-22019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-36881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-87293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-13873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-12699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-80056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-36881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-14346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030001-32622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030001-73079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030001-67220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030001-11185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030001-54413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030002-28037.png)
试题解析:(Ⅰ)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030002-75390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030002-79817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-91151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030002-71475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030003-67753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-36881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030003-12286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-13873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-12699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-80056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025959-36881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030000-14346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030003-22305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025958-94070.png)
(Ⅱ)作
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030003-12697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030003-23126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030004-65936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030004-11493.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023030004-54804.png)
核心考点
试题【如图,已知⊙O的半径为1,MN是⊙O的直径,过M点作⊙O的切线AM,C是AM的中点,AN交⊙O于B点,若四边形BCON是平行四边形.(Ⅰ)求AM的长;(Ⅱ)求s】;主要考察你对圆的方程等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025951-60852.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025945-32372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025946-51793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025946-75268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025945-32372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025946-61700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025946-37026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025947-25762.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-66467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-45065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-30095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-76876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-31808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-82235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-13091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-55893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025936-92141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-66467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025936-62974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025936-14678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025934-76876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-55893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025936-28604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025937-64726.png)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025937-67621.png)
(II)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025937-86844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025935-55893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025936-28604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025937-80511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025929-72492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025930-12122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025930-53647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025930-38644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025929-72492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025930-12122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025930-75609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025931-50185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023025927-78931.png)
A.(2,3) | B.(-2,3) | C.(-2,-3) | D.(2,-3) |
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