题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124042-37197.png)
A.0°< ∠A≤30° | B.30°< ∠A≤45° | C.45°<∠A ≤60° | D.60°< ∠A < 90° |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124043-39821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124043-58019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124043-83764.png)
∴45°<∠A<60°.
故选C.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124038-16228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124038-70931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124039-86636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124034-58261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124035-20857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124035-10577.png)
A.(24-10![]() | B.(24-![]() ![]() | C.(24-5![]() | D.9m |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124022-56279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124022-53966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124022-40647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-39929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-39929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-39393.png)
有向线段包含三个要素:始点、方向和长度,知道了有向线段的始点,它的终点就被方向和长度一确定。解答下列问题:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-71065.png)
小题1:(1)在平面直角坐标系中画出有向线段
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-98821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-10521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-97988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124023-98821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-10521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-49621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-23395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-49621.png)
小题2:(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-55777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124022-40647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-45565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-10521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124024-78359.png)
⊙O经过点D,E是⊙O上一点,且ÐAED=45°.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124013-87163.png)
小题1: (1) 试判断CD与⊙O的位置关系,并证明你的结论;
小题2:(2) 若⊙O的半径为3,sinÐADE=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104124014-18360.png)
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