如图,在△ABC 中,AB AC ,ABC 30,点O 在边 BC 上,⊙O 经过点 A,且与 BC 相交于点 D .
(1)求证: AC 是⊙O 的切线;
(2)若 AB
,请直接写出阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/fcbc15ab-cf74-4813-9f21-a3e3ac912d27.png?resizew=203)
(1)求证: AC 是⊙O 的切线;
(2)若 AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
更新时间:2020-11-16 23:55:10
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适中
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【推荐1】如图,点
为正方形
的对角线
上的一点,连接
并延长交
于点
,交
的延长线于点
,
是
的外接圆,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/fcf6b253-75f5-4c96-b7c6-4f6f3d78895a.png?resizew=146)
(1)求证:
是
的切线;
(2)若
,
,求半径
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4cfadd65fbec8b8d79187bc9efbe1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-证明题
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名校
解题方法
【推荐2】如图,点A是直线AM与⊙O的交点,点B在⊙O上,BD⊥AM垂足为D,BD与⊙O交于点C,OC平分∠AOB,∠B=60°.
(1)求证:AM是⊙O的切线;
(2)若DC=2,求图中阴影部分的面积.(结果保留π和根号)
(1)求证:AM是⊙O的切线;
(2)若DC=2,求图中阴影部分的面积.(结果保留π和根号)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/ea7341c9-00c0-46b6-b50c-5636dbf259b9.png?resizew=138)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,PA是
的切线,切点为A,AC是
的直径,连接OP交
于D.过点C作
,连接AB交OP于点E.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849921067040768/2853073634705408/STEM/5920d8e1-b604-4816-bf3e-60f4eecd321f.png)
(1)求证:PB是
的切线;
(2)若E恰好是OD的中点,且四边形OAPB的面积是
,求阴影部分的面积;
(3)若
且
,求AB的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/2021/11/12/2849921067040768/2853073634705408/STEM/5920d8e1-b604-4816-bf3e-60f4eecd321f.png)
(1)求证:PB是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若E恰好是OD的中点,且四边形OAPB的面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a554e03744b5befe9e0939377dafa8a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20260c9f8315a66fbaaa04fa50366fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
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解答题-证明题
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(0.65)
【推荐2】如图,在
中,点
在斜边
上,以
为圆心,
为半径作圆,分别与
、
相交于点
、
,连接
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/cf641d8b-787e-489c-94d3-dc060c561acd.png?resizew=140)
(1)求证:
是
的切线;
(2)若
,
,求劣弧
与弦
所围图形的面积.
(3)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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