如图,已知
的半径为
,在
中,
、
都是圆的半径,且
.点
在线段
的延长钱上,且
.
![](https://img.xkw.com/dksih/QBM/2021/1/14/2636168060944384/2637453649002496/STEM/c1d29a5e-9745-4c03-b30c-8dd31195fbd0.png?resizew=223)
(1)求线段
的长;
(2)求
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46131668d055a34aebf3e28ea11e90d3.png)
![](https://img.xkw.com/dksih/QBM/2021/1/14/2636168060944384/2637453649002496/STEM/c1d29a5e-9745-4c03-b30c-8dd31195fbd0.png?resizew=223)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
2020·上海崇明·一模 查看更多[5]
上海市崇明区2020-2021学年九年级第一学期教学质量调研数学测试卷(一模)(已下线)第八章 圆(1)(圆和扇形,圆的基本性质)-备战2021年中考数学考点 核心考点清单(上海专用)(已下线)专题20 圆(考点)-备战2021年中考数学考点微专题(上海专用)上海市崇明区2020-2021学年九年级(上)期末数学试卷(一模)(已下线)第二十七章 圆与正多边形(A卷·知识通关练)-【单元测试】2022-2023学年九年级数学下册分层训练AB卷(沪教版上海)
更新时间:2021-01-16 17:36:05
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解答题-证明题
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适中
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名校
【推荐2】如图,在
中,E、F分别在DB和BD的延长线上,且BE=DF,连接CE、CF、AF.
(1)求证:AF=CE;
(2)若AD⊥BD,∠BAD=60°,
,BE=1,求△CEF的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(1)求证:AF=CE;
(2)若AD⊥BD,∠BAD=60°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
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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,已知等腰直角三角形
,点P是斜边
上一点(不与B,C重合),
是
的外接圆
的直径.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/43478e93-71d4-4384-821f-7c3c859646e7.png?resizew=155)
(1)求证:
;
(2)若
的直径为3,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/43478e93-71d4-4384-821f-7c3c859646e7.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1044a0f7af65b233ace6222438983ae.png)
(2)若
![](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2】如图,在矩形
中,延长
到D,使
,延长
到E,使
,连接
.
是菱形;
(2)连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3b9d72a86f08fa8ec476e6934acdef.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56d89e1db474db76d40d4ee34d14e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb1c992134e4a1a733ebfb244f4af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f56fe2c1064b804bb235fe72a4af288.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807f436ed09a455462c4d6aa3e0bcbbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在半径为5的
中,直径
的不同侧有定点C和动点P,已知
,点P在弧
上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/2e1f9080-98be-498e-b4fd-6d19762157e7.png?resizew=120)
(1)当点P与点C关于
对称时,求
的长;
(2)当点P运动到弧
的中点时,求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aea7778d4f8a25fe3c33ce6c0ebc60d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/2e1f9080-98be-498e-b4fd-6d19762157e7.png?resizew=120)
(1)当点P与点C关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(2)当点P运动到弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图是放于水平桌面上的鱼缸,其主体部分的轴截面是圆心为
的弓形
,与桌面
相切于点
,开口部分
与桌面
平行,测得开口部分
,
.(参考数据:
,
)
(1)求弓形
的半径;
(2)求优弧
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176385d91d5e29324fce4a932eff6a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739c4d0dc2cac3bfd94a87f1d0d0633b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e28ab5c2ff1d1254d49c889529aac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aedf4d70ca8341722bbcb31597bdd948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1c1f4cfcce790342cdbf02b2d23e9e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/2a84ce9e-4fff-4fc9-8984-573a36cb578b.png?resizew=205)
(1)求弓形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176385d91d5e29324fce4a932eff6a79.png)
(2)求优弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cacd50508af4235ac863c59f9dcfb6a5.png)
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适中
(0.65)
【推荐1】如图,在平面直角坐标系中,菱形
的对角线
与
交于点
,
轴于点E,正比例函数
的图象与反比例函数
的图象相交于A、P两点.
(1)求m、n的值;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68695a196adebd7a512d28e9b1fbc36.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1d0e90a0656292c8ce7fe1cd51214d.png)
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解答题-证明题
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适中
(0.65)
【推荐2】在△ABC中,∠ACB=90°,∠CAB=30°,△ABD是等边三角形
(1)如图1,E是AB的中点,连结CE并延长交AD于F.
求证:①△AEF≌△BEC;
②四边形BCFD是平行四边形;
(2)如图2,将四边形ACBD折叠,使D与C重合,HK为折痕,求sin∠ACH的值.
(1)如图1,E是AB的中点,连结CE并延长交AD于F.
求证:①△AEF≌△BEC;
②四边形BCFD是平行四边形;
(2)如图2,将四边形ACBD折叠,使D与C重合,HK为折痕,求sin∠ACH的值.
![](https://img.xkw.com/dksih/QBM/2012/5/31/1573396002242560/1573396056186880/STEM/d4a8cccb7c5d45bea9cc3e0cdf314d77.png?resizew=299)
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