解答题-证明题 适中0.65 引用3 组卷269
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.
![](https://img.xkw.com/dksih/QBM/2019/6/15/2225975107092480/2227501919035392/STEM/9682ecd67ed1483484786125f78dda11.png?resizew=146)
(1)求证:∠F=∠ECF;
(2)当DF=6,tan∠EBC=
![](https://img.xkw.com/dksih/QBM/2019/6/15/2225975107092480/2227501919035392/STEM/9682ecd67ed1483484786125f78dda11.png?resizew=146)
2019·浙江温州·二模
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