如图,已知直线PA交⊙O于A、B两点,AE是⊙O的直径,点C为⊙O上一点,且AC平分∠PAE,过C作CD⊥PA,垂足为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f037d541-43eb-41ee-8fa4-182f2bbbdb44.png?resizew=159)
(1)求证:CD为⊙O的切线;
(2)若CD=2AD,⊙O的直径为20,求线段AC、AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/f037d541-43eb-41ee-8fa4-182f2bbbdb44.png?resizew=159)
(1)求证:CD为⊙O的切线;
(2)若CD=2AD,⊙O的直径为20,求线段AC、AB的长.
更新时间:2021-11-30 08:48:05
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解答题-证明题
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【推荐1】如图,在菱形
中,
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三等分,且
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(1)求证:四边形
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解答题-计算题
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【推荐2】如图1,等腰
的边
与正方形
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沿着射线
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、
两点间的距离为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
,
、
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.
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中,描出表中各组数值所对应的点
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(1)列表:如表的已知数据是根据C、D两点间的距离x进行取点、画图、测量,分别得到了x与y的几组对应值;请你通过计算补全表格
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x | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 |
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【推荐1】如图,在菱形ABCD中,对角线AC,BD交于点O,过点A作AE⊥BC于点E,延长BC到点F,使CF=BE,连接DF.
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【推荐1】如图,已知圆
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【推荐2】如图,已知
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(1)若
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cm,求
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(2)若
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【推荐1】如图,已知直线l与⊙O相离,OA⊥l于点A,OA=10,OA与⊙O相交于点P,AB与⊙O切于点B,BP的延长线交直线l于点C.
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(1)试判断线段AB与AC的数量关系,并说明理由;
(2)若PC=4
,求⊙O的半径和线段PB的长.
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【推荐2】如图,
内接于
,直径
交
于点
,延长
至点
,使
,且
,连接
并延长交过点
的切线于点
,且满足
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.
(1)求证:
;
(2)求证:
是
的切线.
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