已知:如图,AB是⊙O的直径,⊙O过AC的中点D,DE⊥BC,交BC于点E.
(1)求证:DE是⊙O的切线;
(2)如果CD=8,CE=6,求⊙O的半径.
(1)求证:DE是⊙O的切线;
(2)如果CD=8,CE=6,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2018/4/8/1919634932531200/1921080282636288/STEM/332d7b1310f9466e8c2a83508da8fbe2.png?resizew=169)
更新时间:2018-04-10 14:30:45
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【推荐1】如图,已知一次函数
与
轴交于点
,与
轴交于点
,一次函数
经过点
与
轴交于点.
(1)求直线
的解析式;
(2)点
为
轴上方直线
上一点,点
为线段
的中点,点
为线段
的中点,连接
,取
的中点
,射线
交
轴于点
,点
为线段
的中点,点
为线段
的中点,连接
,求证:
;
(3)在(2)的条件下,延长
至
,使
,连接
、
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c31170dfbe7a01634a6cfecb94ac8ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
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(3)在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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名校
【推荐2】如图,
是
的中位线,延长
至点
,使
,连接
,
.
是平行四边形.
(2)若
,试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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(2)若
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解答题-证明题
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【推荐1】如图,
过点A,B,并交
边
于D点,直线
分别与
和边
于点E,F,连接
和
,己知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/b57790c1-60a6-4393-87f2-58934b0e8bc8.png?resizew=147)
(1)证明:
为
的切线;
(2)若
,求弧
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2896b49efe2b18522c5bad5d2331a923.png)
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【推荐2】在等边△ABC中,以BC为直径的⊙O与AB交于点D,DE⊥AC,垂足为点E.
(1)求证:DE为⊙O的切线;
(2)计算
.
(1)求证:DE为⊙O的切线;
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33fd78b38f63089ddd5922512a1d33.png)
![](https://img.xkw.com/dksih/QBM/2018/1/7/1855520993910784/1859789277814784/STEM/214662fe94304f8fa9bde6f007af9a50.png?resizew=126)
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解答题-证明题
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【推荐1】已知:在梯形ABCD中,
, AB⊥BC,∠AEB=∠ADC.
![](https://img.xkw.com/dksih/QBM/2016/3/2/1573979604803584/1573979611316224/STEM/5c08758f7e134a49857cf383908e82d5.png?resizew=270)
(1)求证:△ADE∽△DBC;
(2)联结EC,若CD2 =AD·BC ,求证:∠DCE=∠ADB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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(1)求证:△ADE∽△DBC;
(2)联结EC,若CD2 =AD·BC ,求证:∠DCE=∠ADB.
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真题
【推荐2】如图,
是
的直径,点
在
上,
的平分线
交
于点
,过点
作
,交
的延长线于点
,延长
、
相交于点
.
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747775407472640/2747798064152576/STEM/accc37f1-2030-4dca-a218-7823f8318b46.png)
(1)求证:
是
的切线;
(2)若
的半径为5,
,求
的长.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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(2)若
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