如图,
是
的直径,点
为
上一点,连接
,
与
相切,
,分别交
,
于点
,
.
(1)试猜想线段
与
的数量关系,并说明理由;
(2)连接
,若
,
,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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd6ec8fa1147280a0eaba74744b2d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/f00dffe3-a325-457c-a09b-0b0ee0cd1440.jpg?resizew=145)
(1)试猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
更新时间:2023-10-13 08:41:42
|
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解答题-证明题
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适中
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真题
名校
【推荐1】如图,
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135f3f117015e575ae3a0f70edc0d4a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】已知:如图,在直径为10的⊙O中,作两条互相垂直的直径AE和BF,在弧EF上取点C,弦AC交BF于P,弦CB交AE于Q,求证:四边形APQB的面积等于25.
![](https://img.xkw.com/dksih/QBM/2012/2/8/1573337951715328/1573337989431296/STEM/d1c68baa-842a-48ac-a6c1-b0898aeafccd.png)
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解答题-应用题
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【推荐1】雨过天晴,人们常看到天空中出现彩虹,它是由阳光照射到空中弥漫的水珠上时出现的现象.在说明这个现象时,需要分析光线射入水珠后的光路.
已知:一细束光线
射入水珠,水珠可视为一个半径为
的球,球心
到入射光线
的垂直距离为
,折射光线
.(参考数据:
,
)
到折线
的距离;
(2)求光线
与折线
所夹的劣弧
的长.
(3)若这条光线在第一次射出水珠的线路
与水珠所在的
相切,请直接写出光线
与
所在直线所夹的锐角的度数.
已知:一细束光线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,半圆D的直径AB=4,线段OA=7,O为原点,点B在数轴的正半轴上运动,点B在数轴上所表示的数为m.
(1)当半圆D与数轴相切时,m= .
(2)半圆D与数轴有两个公共点,设另一个公共点是C.
①直接写出m的取值范围是 .
②当BC=2时,求△AOB与半圆D的公共部分的面积.
(3)当△AOB的内心、外心与某一个顶点在同一条直线上时,求tan∠AOB的值.
(1)当半圆D与数轴相切时,m= .
(2)半圆D与数轴有两个公共点,设另一个公共点是C.
①直接写出m的取值范围是 .
②当BC=2时,求△AOB与半圆D的公共部分的面积.
(3)当△AOB的内心、外心与某一个顶点在同一条直线上时,求tan∠AOB的值.
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解答题-证明题
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适中
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【推荐1】如图,
是
的外接圆,
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交
于点E.
(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d6760a499e85910b9889c79a72e235c.png)
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解答题-作图题
|
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(0.65)
名校
【推荐2】如图,已知
,
,
.
(1)在
边上求作点
,连接
,使
(要求:尺规作图,不写作法,保留作图痕迹);
(2)在第(1)问图中,若
,
①求
;
②已知经过点
的圆
与
相切于点
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的长.
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(1)在
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(2)在第(1)问图中,若
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①求
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②已知经过点
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