题目
题型:不详难度:来源:
(1)求证:AD//EC;
(2)若AD是⊙O2的切线,且PA=6,PC =2,BD =9,求AD的长。
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-20035.png)
答案
解析
(1)证明:连接
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-20705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-86346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-25414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034424-69598.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034424-15335.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034424-66352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034423-25414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034424-37469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-13157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-78054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-59681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-81881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-13157.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034426-23510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034426-35075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034426-29908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-13157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034426-71104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034425-13157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034427-91995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034427-95163.png)
核心考点
试题【如图,⊙O1与⊙O2相交于A、B两点,过点A作⊙O1的切线交⊙O2于点C,过点B作两圆的割线,分别交⊙O1、⊙O2于点D、E,DE与AC相交于点P.(1)求证:】;主要考察你对圆的方程等知识点的理解。[详细]
举一反三
如图,AB、CD是圆的两条平行弦,BE//AC,BE交CD于E、交圆于F,过A点的切线交DC的延长线于P,PC=ED=1,PA=2.
(1)求AC的长;
(2)求证:BE=EF.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034415-41909.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034403-96771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-85657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-10150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-69687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-36216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-64851.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-78199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-49905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-16784.png)
(Ⅱ)在(Ⅰ)的条件下,若以点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-80491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034406-50273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-80491.png)
(Ⅲ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034406-50273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034406-84159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034404-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-80491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034406-50273.png)
求圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034405-80491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-74732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-67905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-69795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-34031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-33833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034357-77029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034356-67905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034357-85299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034352-48088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034352-96723.png)
(1)求证:FB=FC;
(2)求证:FB2=FA·FD;
(3)若AB是△ABC外接圆的直径,∠EAC=120°,BC=6 cm,求AD的长.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034348-79604.jpg)
最新试题
- 1下列各项中注音有误的一项是( )A.人影幢幢zhuàng啼哭tídǐ中流砥柱B.氏族shì通牒dié情深意笃dǔC.封
- 2阅读下列材料:“洋商见我工商竞用新法,深中其忌,百般阻抑,勒价停市。上年江浙、湖北等省,绿丝、纺纱各厂,无不亏折,有歇业
- 3下列说法或表示方法中正确的是A.等质量的硫蒸气和硫固体分别完全燃烧,后者放出的热量多B.由C(金刚石)→C(石墨)ΔH=
- 4(本小题满分12分)解不等式:
- 5设U=R,A={x|x-a>0},B={x|2<x<5},求:(1)CUB;(2)当BA时,求a的取值范围。
- 612月22日,下列城市中白昼最长的是[ ]A、漠河 B、北京 C、广州 D、悉尼
- 7若sin2a>0且sina<0,则a是( )A.第二象限角B.第三象限角C.第一或第三象限角D.第二或第三象限角
- 82012年3·15晚会的主题是 [ ]A.消费与发展B.消费与责任C.消费与和谐D.消费与安全
- 9(1)以“我眼中的色彩”为题写一篇不少于600字的文章。(2)阅读下面的材料,以“我生活在
- 10下列反应在210℃达到平衡:PCl5(g)PCl3(g)+Cl2(g),其△H>0,K1=1 ①CO(g)+Cl2(g)
热门考点
- 1某电解质溶液中可能存在的离子为:Ag+、H+、Cu2+、CO32-、OH-、Cl-,你认为可以肯定存在的离子有_____
- 2将多项式3+5x2y﹣4xy﹣5x3y2﹣7x4y按字母x的降幂排列是( ).
- 3下列说法正确的是( )A.电荷放在电势高的地方,电势能就大B.无论正电荷还是负电荷,克服电场力做功它的电势能都增大C.
- 4一只电烙铁的额定电压是220V,额定功率是40W,正常工作10min产生______J的热量;如果实际工作电压只有110
- 5下列事例中,属于使用次声的是( )A.用声呐技术测海底深度B.蝙蝠确定目标的方向和距离C.海豚判断物体的位置和大小D.
- 6 正确评价历史人物必须首先明确人物的身份。如果要让你给图中这三个人物冠以一个共同的身份,你可以选择的是 克伦
- 7下列说法中正确的是( )A.温度越高的物体,放出的热量越多B.在“摩擦生热”的过程中,内能转化为机械能C.铁块很难被压
- 8如图,光滑的水平轨道AB与半径为R的光滑的半圆形轨道BCD相切于B点,其中圆轨道在竖直平面内,B为最低点,D为最高点,一
- 9不同商品生产者生产同一种商品,按同一价格出售,为什么有的赔钱有的赚钱?同一商品生产者出售同一种商品,为什么有时赔钱有时赚
- 10John __ confidence not only from his teacher’s encouraging w