已知:如图,AB是
的直径,点C,点D在
上,点E在
外,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/88309588-4e94-4d07-8794-a76004e66ce0.png?resizew=154)
(1)求证:直线AE是
的切线;
(2)若
°,
时,求劣弧AC的长(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027d53067b9649fe91f43c30584700c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/88309588-4e94-4d07-8794-a76004e66ce0.png?resizew=154)
(1)求证:直线AE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f00b71732a0f83cc5b8e9d81fc8692da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
更新时间:2022-09-06 11:10:57
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【推荐1】如图,在圆内接四边形ABCD中,O为圆心,∠BOD=160°,求∠BCD的度数.
![](https://img.xkw.com/dksih/QBM/2019/2/7/2135348333199360/2137594820878336/STEM/5188fc6991354c38947cc66fe37ff8b1.png?resizew=143)
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【推荐2】如图,
ABC是⊙O的内接三角形,
,
,连接AO并延长交⊙O于点D,过点C作⊙O的切线,与BA的延长线相交于点E.
(1)求证:AD∥EC;
(2)若AD=6,求线段AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3f8cb648966fd4ff28896fe8f9e04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
(1)求证:AD∥EC;
(2)若AD=6,求线段AE的长.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893082953318400/2895184580820992/STEM/923d208f-af53-4878-b8ad-5a09c0c7ac57.png?resizew=138)
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【推荐1】如图,
的外接圆直径
交
于点E,已知
,
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,点
、
、C、
均在
上,
为直径,
.若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】如图,在
中,以
为直径的
交
于点D,点E是
上一点,
.
(1)求证:
是
的切线;
(2)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdaf297101d00130986a3a455f4c252b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/65ef5781-fa71-4a7f-b81f-2680adbb4646.png?resizew=150)
(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/fc12eff1ddc83f80208a57f5e8fe1219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】阅读下面材料:
在学习《圆》这一章时,老师给同学们布置了一道尺规作图题:
尺规作留:过圆外一点作圆的切线.
己知:P为
外一点.
求作:经过点P的
的切线.
小敏的作法如下:
如图,
①连接OP,作线段OP的垂直平分线MN交OP于点C.
②以点C为圆心,CO的长为半径作圆,交
于A,B两点.
③作直线PA,PB.
(1)请补充完整小敏的作图.
(2)连接OA,OB可证
,其依据是______________________________
由此可证明直线PA,PB都是
的切线,其依据是______________________________
在学习《圆》这一章时,老师给同学们布置了一道尺规作图题:
尺规作留:过圆外一点作圆的切线.
己知:P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求作:经过点P的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/5e155b98-3c07-4afd-9b3e-04bb55cbda60.jpg?resizew=156)
小敏的作法如下:
如图,
①连接OP,作线段OP的垂直平分线MN交OP于点C.
②以点C为圆心,CO的长为半径作圆,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
③作直线PA,PB.
(1)请补充完整小敏的作图.
(2)连接OA,OB可证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655e376555ccc82ccd72aac59d3949da.png)
由此可证明直线PA,PB都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,
为
的直径,
是
延长线上一点,且
为
的切线,
为切点,连结
.
(1)求
的长(结果保留
).
(2)求证:
为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/1e03d153-35b4-4944-900f-b46628f1ea33.png?resizew=184)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
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【推荐2】如图,
为
直径,
,点C,D(异于A,B两点)在
上,且
平分
,交
于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/1c3b1209-807d-47b9-8153-f6753509a512.png?resizew=156)
(1)求证:
;
(2)若
,求
的长(结果保留π).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/1c3b1209-807d-47b9-8153-f6753509a512.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0a865bec8808097745a891f2942a90.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f34f55889ebc0f945270beb94f98b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
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