如图,AB是⊙O的直径,BE是弦,点D是弦BE上一点,连接OD并延长交⊙O于点C,连接BC,在过点D垂直于OC的直线上取点F.使∠DFE=2∠CBE.
(1)请说明EF是⊙O的切线;
(2)若⊙O的半径是6,点D是OC的中点,∠CBE=15°,求线段EF的长.
(1)请说明EF是⊙O的切线;
(2)若⊙O的半径是6,点D是OC的中点,∠CBE=15°,求线段EF的长.
![](https://img.xkw.com/dksih/QBM/2019/6/12/2223851779891200/2225328082911232/STEM/723171d301934ba29041c9e5adea406a.png?resizew=153)
更新时间:2019-05-07 07:33:31
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解答题-证明题
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【推荐1】如图,
是
的直径,
,
,
在圆上,且
,过点
的切线和
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/9578414c-0a4c-45a4-bef1-9eb5b2a5230f.png?resizew=171)
(1)求证:
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9eda8d5e77202cbe5841b33c4e3c544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/9578414c-0a4c-45a4-bef1-9eb5b2a5230f.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28aa3ef1dbca402dfb4c6fca38c0dbf2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】如图,在△ABC中,AB=BC,D是AC中点,BE平分∠ABD交AC于点E,点O是AB上一点,⊙O过B、E两点,交BD于点G,交AB于点F.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894363887288320/2973412634116096/STEM/5aadedfc-29cd-437c-a374-8179b220ff9c.png?resizew=171)
(1)判断直线AC与⊙O的位置关系,并说明理由;
(2)若EB⊥BC,ED=3,求BG的长.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894363887288320/2973412634116096/STEM/5aadedfc-29cd-437c-a374-8179b220ff9c.png?resizew=171)
(1)判断直线AC与⊙O的位置关系,并说明理由;
(2)若EB⊥BC,ED=3,求BG的长.
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【推荐1】如图,
是⊙
的直径,点
是⊙
上一点,点
是
的中点,过点
作⊙
的切线,与
、
的延长线分别交于点
、
,连接
.
(1)求证:证明
.
(2)填空:①已知
,当
______时,
.
②连接
、
、
.当
的度数为______时,四边形
是菱形.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
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(1)求证:证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1702ce8d0c64af6ec3c23abcd2a038ac.png)
(2)填空:①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8256a7aded59ef1150eb874a4eecdab0.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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【推荐2】如图,点D是以
为直径的
上一点,过点B作
的切线,交
的延长线于点C,E是
的中点,连接
并延长与
的延长线交于点F.
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(1)求证:
是
的切线;
(2)若
,
,求
的半径;
(3)在(2)条件下,求
、
、弧
围成的阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca643ab6fd746974b2882c86fda2df2.png)
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(3)在(2)条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】已知
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【推荐2】如图,在单位长度为1的正方形网格中,一段圆弧经过网格的交点A、B、C.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573983905513472/1573983912009728/STEM/c2286ee30f8d4a2793116d1a29aec920.png?resizew=160)
(1)请完成如下操作:①以点O为原点、竖直和水平方向为轴、网格边长为单位长,建立平面直角坐标系;②根据图形提供的信息,标出该圆弧所在圆的圆心D,并连接AD、CD.
(2)请在(1)的基础上,完成下列填空:
①写出点的坐标:C 、D ;
②⊙D的半径= (结果保留根号);
③∠ADC的度数为 .
④网格图中是否存在过点B的直线BE是⊙D的切线?如果没有,请说明理由;如果有,请直接写出直线BE的函数解析式.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1573983905513472/1573983912009728/STEM/c2286ee30f8d4a2793116d1a29aec920.png?resizew=160)
(1)请完成如下操作:①以点O为原点、竖直和水平方向为轴、网格边长为单位长,建立平面直角坐标系;②根据图形提供的信息,标出该圆弧所在圆的圆心D,并连接AD、CD.
(2)请在(1)的基础上,完成下列填空:
①写出点的坐标:C 、D ;
②⊙D的半径= (结果保留根号);
③∠ADC的度数为 .
④网格图中是否存在过点B的直线BE是⊙D的切线?如果没有,请说明理由;如果有,请直接写出直线BE的函数解析式.
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