已知四边形ABCD是⊙O的内接四边形,AC是⊙O的直径,DE⊥AB,垂足为E
(1)延长DE交⊙O于点F,延长DC,FB交于点P,如图1.求证:PC=PB;
(2)过点B作BG⊥AD,垂足为G,BG交DE于点H,且点O和点A都在DE的左侧,如图2.若AB=
,DH=1,∠OHD=80°,求∠BDE的大小.
(1)延长DE交⊙O于点F,延长DC,FB交于点P,如图1.求证:PC=PB;
(2)过点B作BG⊥AD,垂足为G,BG交DE于点H,且点O和点A都在DE的左侧,如图2.若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2018/7/12/1986905269690368/2046998175834112/STEM/46e101a8f642448a8391c0a5c0a0aa03.png?resizew=328)
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更新时间:2018-10-05 12:11:21
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【知识点】 圆与三角形的综合(圆的综合问题)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,在
中,
是直径,点
是
上一点,且
,过点
作
的切线
交
延长线于点
,
为弧
的中点,连接
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2023/1/17/3154859095818240/3155436926492672/STEM/909827b2dbbd4c6683e14604ba231768.png?resizew=180)
(1)求证:
;
(2)已知图中阴影部分面积为6π.
求
的半径
;
直接写出图中阴影部分的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e87c8c0b4584700f37a23bb32b7a642.png)
(2)已知图中阴影部分面积为6π.
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解答题-问答题
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较难
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【推荐2】如图,已知AB=10,以AB为直径作半圆O,半径OA绕点O顺时针旋转得到OC,点A的对应点为C,当点C与点B重合时停止.连接BC并延长到点D,使得CD=BC,过点D作DE⊥AB于点E,连接AD,AC.
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(1)AD= ;
(2)如图1,当点E与点O重合时,判断△ABD的形状,并说明理由;
(3)如图2,当OE=1时,求BC的长;
(4)如图3,若点P是线段AD上一点,连接PC,当PC与半圆O相切时,直接写出直线PC与AD的位置关系.
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(1)AD= ;
(2)如图1,当点E与点O重合时,判断△ABD的形状,并说明理由;
(3)如图2,当OE=1时,求BC的长;
(4)如图3,若点P是线段AD上一点,连接PC,当PC与半圆O相切时,直接写出直线PC与AD的位置关系.
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解答题-作图题
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较难
(0.4)
名校
【推荐3】(1)如图①,在
中,
,
.尺规作图:作
的外接圆
,并直接写出
的外接圆半径
的长.
(2)如图②,
的半径为13,弦
,
是
的中点,
是
上一动点,求
的最大值.
(3)如图③所示,
,
、
是某新区的三条规划路,其中
,
,
,
所对的圆心角为
,新区管委会想在
路边建物资总站点
,在
,
路边分别建物资分站点
、
,也就是,分别在
、线段
和
上选取点
、
、
.由于总站工作人员每天都要将物资在各物资站点间按
的路径进行运输,因此,要在各物资站点之间规划道路
、
和
.为了快捷、环保和节约成本.要使得线段
、
、
之和最短,试求
的最小值.(各物资站点与所在道路之间的距离、路宽均忽略不计)
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(3)如图③所示,
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