题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041526-86761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-94624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-57810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-33898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-10206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-71347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-45851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-10206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-62339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-21820.png)
小题1:当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041529-46237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041529-44692.png)
小题2:当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041529-21416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041529-52772.png)
小题3:若要使点
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-62339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041530-14406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041530-17354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041530-54652.jpg)
答案
小题1:连接
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041530-45470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-71347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041530-25529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041531-56395.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041531-56452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041531-99197.png)
小题1:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041531-78242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041528-71347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041532-20665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041532-45123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041531-56452.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041532-45820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041532-65364.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041526-86761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041533-99656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041533-38503.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041532-20665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041533-68394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041533-50076.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041533-48165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041534-55155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041534-44701.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041534-95976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041534-79054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041535-44908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041535-67324.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041535-24905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041527-57810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041535-97247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041536-79144.png)
小题1:
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041536-61143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041536-41939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041536-90561.png)
解析
小题1:首先连接OD,由圆周角定理,可求得∠DOB的度数,又由⊙O的直径为2 3,即可求得其半径,然后由弧长公式,即可求得答案;
小题1:首先证得△ACD∽△BED,然后由相似三角形的对应边成比例,可得
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041535-24905.png)
小题1:首先求得A与E重合时α的度数,则可求得点E在线段BA的延长线上时,α的取值范围.
核心考点
试题【如图所示,,,,点是以为直径的半圆上一动点,交直线于点,设.小题1:当时,求的长;小题2:当时,求线段的长;小题3:若要使点在线段的延长线上,则的取值范围是__】;主要考察你对圆的认识等知识点的理解。[详细]
举一反三
A.50° | B.25° | C.100° | D.40° |
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041523-35274.png)
小题1:判断直线CE与⊙O的位置关系,并证明你的结论;
小题2:若AF∶FC=5∶3,AE=16,求⊙O的直径AB的长.
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041520-88527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041516-57036.png)
小题1:当
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041512-49265.png)
小题2:当x为何值时,PD×CD的值最大?最大值是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041513-61595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041508-14908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041508-45680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041508-14908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041508-79778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041508-38714.png)
A.20° B.25° C.30° D.40°
![](http://img.shitiku.com.cn/uploads/allimg/20191105/20191105041509-85353.jpg)
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