如图,在RtΔABC中,∠C=90°,∠BAC的角平分线AD交BC边于D,以AB上某一点O为圆心作⊙O,使⊙O经过点A和点D,与AB边的另一个交点为E.
(1)判断直线BC与⊙O的位置关系,并说明理由;
(2)若⊙O的半径为4,∠B=30°.求线段BD、BE与劣弧DE所围成的阴影部分的图形面积.
(1)判断直线BC与⊙O的位置关系,并说明理由;
(2)若⊙O的半径为4,∠B=30°.求线段BD、BE与劣弧DE所围成的阴影部分的图形面积.
![](https://img.xkw.com/dksih/QBM/2017/12/22/1843960508383232/1845792741285888/STEM/efc654412aad48fc9dfca20a71919ed7.png?resizew=178)
更新时间:2017-12-25 05:37:51
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解答题-证明题
|
适中
(0.65)
【推荐1】已知:如图,
内接于⊙
,点
在
的延长线上,
.
![](https://img.xkw.com/dksih/QBM/2015/2/10/1573800982831104/1573800989343744/STEM/816649ce37bc4c66978e521ac88d3f36.png)
(1)求证:
是⊙
的切线;(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://img.xkw.com/dksih/QBM/2015/2/10/1573800982831104/1573800989343744/STEM/816649ce37bc4c66978e521ac88d3f36.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cee097d4fe948c3d4f1b5c28b24adf3.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,点
是边
上一点,以
为直径的
与
交于点
,连接
并延长交
的延长线于点
,且
.
(1)求证:
为
的切线;
(2)若
,
,求
的半径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/462e9a80-3835-4ce9-9fc7-0f0f53d53e02.png?resizew=130)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734f6e7783b0e104fc06b01f77af990f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,AB是
的弦,AC经过圆心O交
于点D,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/d656d721-4ab6-413b-a5b8-a6c5afd8d4a2.png?resizew=179)
(1)求证:BC是
的切线;
(2)设
的半径为2,求图中阴影部分的面积.
![](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/editorImg/2022/10/11/d656d721-4ab6-413b-a5b8-a6c5afd8d4a2.png?resizew=179)
(1)求证:BC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
ABC内接于⊙O,点D在半径OB的延长线上,∠BCD=∠A=30°.
(2)若CD=2
,求由弧BC、线段CD和BD所围成的阴影部分面积(结果保留π和根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db999650f7f40ac6aaf3ff856ea4ca40.png)
(2)若CD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
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