如图,AB是⊙O的直径,点C在AB的延长线上,CD与⊙O相切于点D,CE⊥AD,交AD的延长线于点E.
(1)求证:∠BDC=∠A;
(2)若CE=4,DE=2,求AD的长.
(1)求证:∠BDC=∠A;
(2)若CE=4,DE=2,求AD的长.
![](https://img.xkw.com/dksih/QBM/2017/4/6/1659773364092928/1660758900563968/STEM/8a53c665305340c8a31d316c8f7e8fae.png?resizew=239)
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更新时间:2016-12-06 13:24:18
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【推荐1】如图,AB为⊙O的直径,C为BA延长线上一点,CD是⊙O的切线,D为切点,作OF⊥AD于点E,交CD于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/7/2931333584224256/2946807988453376/STEM/4d5aa6c9a30d41648d6c0d670ba54d14.png?resizew=189)
(1)在不增加辅助线的情况下,请直接写出图中一对相等的角,并证明;
(2)若BD=8,EF=2,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2022/3/7/2931333584224256/2946807988453376/STEM/4d5aa6c9a30d41648d6c0d670ba54d14.png?resizew=189)
(1)在不增加辅助线的情况下,请直接写出图中一对相等的角,并证明;
(2)若BD=8,EF=2,求⊙O的半径.
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【推荐2】如图,
为
的直径,
为
延长线上一点,
是
的切线,
为切点,
于点
,交
于点
.
;
(2)若
,
,求
的长.
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(2)若
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【推荐1】如图,已知⊙O的直径AC与弦BD相交于点F,点E是DB延长线上的一点,∠EAB=∠ADB.
(1)求证:AE是⊙O的切线;
(2)已知点B是EF的中点,求证:△EAF∽△CBA;
(3)已知AF=4,CF=2,在(2)的条件下,求AE的长.
(1)求证:AE是⊙O的切线;
(2)已知点B是EF的中点,求证:△EAF∽△CBA;
(3)已知AF=4,CF=2,在(2)的条件下,求AE的长.
![](https://img.xkw.com/dksih/QBM/2017/6/12/1707371973918720/1708044192866304/STEM/3c665b7ecee64c9f99a22dde05f78d26.png?resizew=143)
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【推荐2】如图,
中,
,
,在
上截取
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作
于点
,连接
,以点
为圆心,
长为半径作圆
.
是
的切线;
(2)若
,
,求
,
的长.
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