如图,AB=BC,以AB为直径的⊙O交AC于点D,过D作DE⊥BC,垂足为E.
(1)求证:DE是⊙O的切线;
(2)作DG⊥AB交⊙O于G,垂足为F,若∠A=30°,AB=8,求弦DG的长.
(1)求证:DE是⊙O的切线;
(2)作DG⊥AB交⊙O于G,垂足为F,若∠A=30°,AB=8,求弦DG的长.
![](https://img.xkw.com/dksih/QBM/2015/12/15/1573942019596288/1573942026043392/STEM/74ec5e75-b936-420c-a099-8b1f2e2266d6.png?resizew=214)
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2014届甘肃省嘉峪关市四中-新城中学九年级上期末联考数学试卷2016届江苏省东台市第一教研片九年级上学期第一次月考数学试卷湘教版九年级数学下册 第二章 圆 单元检测试卷(已下线)第24章 综合测评卷(2)-2018年九年级下册数学名师学案(沪科版)山东省日照市莒县第三中学2021-2022学年九年级上学期第一次月考数学试题
更新时间:2016-12-06 03:36:09
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【推荐1】如图,D为
上一点,点C在直径
的延长线上,且
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(1)求证:
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(2)求证:CD是
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(3)过点B作
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【推荐2】如图,AB是⊙O的直径,D是⊙O上一点,E是AB延长线上一点,AC⊥DE交ED延长线于C,CF∥AB,交AD延长线于F,且CF=AC.
(1)求证:CE是⊙O的切线;
(2)求证:AC•BE=CD•DE;
(3)若BE=3,DE=
,求AF的长.
(1)求证:CE是⊙O的切线;
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(3)若BE=3,DE=
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【推荐1】如图,在菱形
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【推荐2】如图,AB、BF分别是⊙O的直径和弦,且CD⊥AB于点E,CD与BF相交于点G,延长DC到点H,连接HF,使HF=HG.
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(1)求证:HF是⊙O的切线;
(2)若sin∠HGF=
,BF=3,连接AF,求AF的长.
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