如图,AB为⊙O的直径,点P为AB延长线上一点,点C为⊙O上一点,PC=4,PB=2,AB=6,求证:PC是⊙O的切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/eae54b17-0b3e-4754-a624-1a3354863c6e.png?resizew=233)
更新时间:2018-04-09 21:49:32
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解答题-作图题
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【推荐1】如图,在△ABC中,AB、BC、AC三边的长分别是
,
,
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(1)△ABC的面积是 ;
(2)请在图1中作出△ABC关于直线l对称的△A1B1C1;
(3)请在图2中画出△DEF,是DE、EF、DF三边的长分别是
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(1)△ABC的面积是 ;
(2)请在图1中作出△ABC关于直线l对称的△A1B1C1;
(3)请在图2中画出△DEF,是DE、EF、DF三边的长分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4cee6655a37fc8243928b5dbb09fd4.png)
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解答题-问答题
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【推荐2】阅读材料完成下面问题:求一个锐角的三角函数值.我们往往需要找出(或构造出)一个直角三角形,观察(图1)发现
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d293c1dd7b65083c25af30de8f4dc1.png)
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(2)如图2,在边长为1的正方形网格中,
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解答题-证明题
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【推荐1】如图,直线
交
于A,B两点,
是直径,
平分
交
于D,过D作
于点E
是
的切线;
(2)若
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的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(2)若
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解答题-证明题
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【推荐2】如图,已知AB是⊙O的直径,点C在⊙O上,AD⊥DC于点D,AC平分∠DAB.
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933159057809408/2936251349516288/STEM/477b42f2-7906-4de7-9135-29d6ff2d018c.png?resizew=152)
(1)求证:直线CD是⊙O的切线;
(2)若AD=3,∠DAC=30°,求⊙O的面积.
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933159057809408/2936251349516288/STEM/477b42f2-7906-4de7-9135-29d6ff2d018c.png?resizew=152)
(1)求证:直线CD是⊙O的切线;
(2)若AD=3,∠DAC=30°,求⊙O的面积.
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