如图,⊙O的直径AB=10,∠ACB的平分线CD交⊙O于D,过点D作DE∥AB交CA的延长线于点E,连接AD,BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/5f8cc964-6d02-4f59-b687-2535c17951fe.png?resizew=146)
(1)求由AB,BD,弧AD围成的阴影部分的面积;
(2)求证:DE是⊙O的切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/5f8cc964-6d02-4f59-b687-2535c17951fe.png?resizew=146)
(1)求由AB,BD,弧AD围成的阴影部分的面积;
(2)求证:DE是⊙O的切线.
更新时间:2022-04-11 10:33:51
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【推荐1】已知
的直径为10,点A,B,C在
上,
的平分线交
于点D.
(I)如图①,当BC为OO的直径时,求BD的长;
(Ⅱ)如图②,当BD=5时,求∠CDB的度数.
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(I)如图①,当BC为OO的直径时,求BD的长;
(Ⅱ)如图②,当BD=5时,求∠CDB的度数.
![](https://img.xkw.com/dksih/QBM/2019/6/4/2218191545237504/2218205629939712/STEM/0818683fb91b4912aa943c899ae4e9e5.png?resizew=132)
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【推荐2】如图,AB是⊙O的直径,点C在⊙O上且不与点A、B重合,∠ABC的平分线交⊙O于点D,过点D作DE⊥AB,垂足为点G,交⊙O于点E,连接CE交BD于点F,连接FG.
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(1)求证:FG=
DE;
(2)若AB=4
,FG=4,求AG的长
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【推荐1】如图,在△ABC中,AB=BC,以BC为直径的⊙O交AC于点D,过点D作DE⊥AB,DF⊥BC,垂足分别为E、F.
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