如图,
是
的直径,
,点
是劣弧
上一点,过点
作
的切线
,交
的延长线于点
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694591132655616/2700909751148544/STEM/062ad464-6ffa-461e-8ca1-ca16359e133a.png)
(1)求证:
;
(2)若
,
,过点
作
交
于点
,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/cbf1c1cee80e7072d6b74d0dc38f3461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14f419e14bc30fe2fada469a0fbbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694591132655616/2700909751148544/STEM/062ad464-6ffa-461e-8ca1-ca16359e133a.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f439c70fb0e565a074e09066ce9233.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a46ed67c00c3d2f3f525520e2f43481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db90cbd13ac54390201e40dc06edad6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
更新时间:2021-04-16 09:17:52
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
与
相切于点
,分别交
于点
.
(1)求证:
平分
;
(2)当
时,求劣弧
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6414b7e7629c50efcf38b3ff9e58a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249eaab2f312c945ab2bfbf69cadb778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87ab63321823962564a03fa9a5765dc.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394062474788864/2394110504239104/STEM/5314018dea5a40a5be53523084f81cd0.png?resizew=171)
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适中
(0.65)
名校
【推荐2】如图,
中,
,
.
,点
是
上一点,以
为圆心作
,
若
经过
、
两点,求
的半径,并判断点
与
的位置关系.
若
和
、
都相切,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e040fc34352770f1b024b38bd1e9b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98f0db1041fa3f958e44c09a5483f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92186285f012cadddd4e7333e1572fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://img.xkw.com/dksih/QBM/2018/10/1/2044205974077440/2044848041574400/STEM/40c90b4f90ad4fa7a5ec444b1fbe6db5.png?resizew=289)
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解答题-证明题
|
适中
(0.65)
【推荐1】阅读下面材料:如图1,圆的概念:在平面内,线段PA绕它固定的一个端点P旋转一周,另一个端点A所形成的图形叫做圆.就是说,到某个定点等于定长的所有点在同一个圆上.圆心在P(a,b),半径为r的圆的方程可以写为:
.如:圆心在P(2,-1),半径为5的圆的方程为:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/31b85c94-ff3e-402f-8c6f-c44439b5b1af.png?resizew=320)
(1)填空:①以A(3,0)为圆心,1为半径的圆的方程为: ;②以B(-1,-2)为圆心,
为半径的圆的方程为: ;
(2)根据以上材料解决以下问题:
如图2,以B(-6,0)为圆心的圆与y轴相切于原点,C是☉B上一点,连接OC,作
垂足为D,延长BD交y轴于点E,已知sin∠AOC=
.
①连接EC,证明EC是
的切线;
②在BE上是否存在一点P,使PB=PC=PE=PO,若存在,求P点坐标,并写出以P为圆心,以PB为半径的☉P的方程;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e885d3743ae3d9f0fbd740b75f900083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de926bdf852c844170c110b6fc56cf62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/31b85c94-ff3e-402f-8c6f-c44439b5b1af.png?resizew=320)
(1)填空:①以A(3,0)为圆心,1为半径的圆的方程为: ;②以B(-1,-2)为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)根据以上材料解决以下问题:
如图2,以B(-6,0)为圆心的圆与y轴相切于原点,C是☉B上一点,连接OC,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c627c9216591f403b43b39a057bbb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
①连接EC,证明EC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
②在BE上是否存在一点P,使PB=PC=PE=PO,若存在,求P点坐标,并写出以P为圆心,以PB为半径的☉P的方程;若不存在,说明理由.
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(0.65)
名校
【推荐2】如图,AB是⊙O的直径,点C在AB的延长线上,CD切⊙O于点D.若∠C=45°,AB=8.
(1)求BC的长;
(2)求阴影部分的面积(结果保留π).
(1)求BC的长;
(2)求阴影部分的面积(结果保留π).
![](https://img.xkw.com/dksih/QBM/2019/5/17/2205465301819392/2208689312481280/STEM/2366471a0df8476bb6cd976240f7b58e.png?resizew=151)
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