已知,如图,BD为⊙O的直径,点A、C在⊙O上并位于BD的两侧,∠ABC=45°,连结CD、OA并延长交于点F,过点C作⊙O的切线交BD延长线于点E.
(1)求证:∠F=∠ECF;
(2)当DF=6,tan∠EBC=
,求AF的值.
(1)求证:∠F=∠ECF;
(2)当DF=6,tan∠EBC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2019/6/15/2225975107092480/2227501919035392/STEM/9682ecd67ed1483484786125f78dda11.png?resizew=146)
更新时间:2019-06-17 12:47:10
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【推荐1】如图,在Rt△ABC中,∠ACB=90°,点D是边AB上一点,以BD为直径的⊙O与边AC相切于点E,连接DE并延长DE交BC的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2013/9/28/1573688504246272/1573688510701568/STEM/455702ba-dbad-4eed-ae10-e513bf390638.png)
(1)求证:BD=BF;
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![](https://img.xkw.com/dksih/QBM/2013/9/28/1573688504246272/1573688510701568/STEM/455702ba-dbad-4eed-ae10-e513bf390638.png)
(1)求证:BD=BF;
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![](https://img.xkw.com/dksih/QBM/2013/9/28/1573688504246272/1573688510701568/STEM/fd2a440d28de40029b1d219b1bf3dc80.png?resizew=15)
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【推荐2】已知:如图14,⊙A与
轴交于C、D两点,圆心A的坐标为(1,0),⊙A的半径为
,过点C作⊙A的切线交
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(1)求切线BC的解析式;
(2)若点P是第一象限内⊙A上的一点,过点P作⊙A的切线与直线BC相交于点G,且∠CGP=120°,求点G的坐标.
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(1)求切线BC的解析式;
(2)若点P是第一象限内⊙A上的一点,过点P作⊙A的切线与直线BC相交于点G,且∠CGP=120°,求点G的坐标.
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【推荐2】如图,在平面直角坐标系
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