如图所示,
是圆
的一条弦,
,垂足为
,交圆
于点C、D.
(1)若
,求
的度数;
(2)若
,
,求圆
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cee097d4fe948c3d4f1b5c28b24adf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/a2bbd738-1474-4d7a-bf80-a7a1005e3bc1.png?resizew=118)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f35c3ac3494b0e1d8610b3c59e8aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea7b811fa609b8e92da877471564e07.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f392cf697f88fc22678b5d02cbffb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
22-23九年级上·江苏盐城·期中 查看更多[10]
江苏省盐城市大丰区2022-2023学年九年级上学期期中数学试题浙江省舟山市金衢山五校联盟2022-2023学年九年级上学期12月质量监测数学试题(已下线)重难点04“垂径定理”模型-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)(已下线)2023年安徽省中考数学真题变式题16-20题(已下线)专题2.7 圆的对称性(弧、弦、圆心角)(知识梳理与考点分类讲解)-2023-2024学年九年级数学上册基础知识专项突破讲与练(苏科版)(已下线)专题08圆的对称性(4个知识点6种题型1个易错考点2种中考考法)-【帮课堂】2023-2024学年九年级数学上册同步学与练(苏科版)浙江省绍兴市越城区永和高级中学2023-2024学年九年级上学期10月月考数学试题(已下线)专题24.7 弧、弦、圆心角(知识梳理与考点分类讲解)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)江苏省淮安市2023-2024学年九年级上学期期中数学试题江苏省淮安市淮安区2023-2024学年九年级上学期期中数学学业质量调研试卷
更新时间:2023-10-09 23:10:08
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解答题-作图题
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【推荐1】如图,在正方形ABCD中,E是AB上一点,BE=2,AE=3BE,P是AC上一动点,连接PE,PB.
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(2)求出△BPE周长的最小值.
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【推荐2】如图,在四边形中,
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解答题-证明题
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【推荐1】如图,已知AB为⊙O的直径,AC、CD是弦.
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![](https://img.xkw.com/dksih/QBM/2022/2/25/2923914003546112/2924766048272384/STEM/e1e344e1-bf4b-43be-8018-2f80672a6aaa.png?resizew=184)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02309e614d719a634c2412956a16f99.png)
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解答题-证明题
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【推荐2】如图,四边形
是
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(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/a7e5d907-0408-474b-b887-596b96adb4de.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67930e8c0c05cc78044e6012bc9cf477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
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解答题-作图题
|
较易
(0.85)
【推荐1】请完成以下作图和填空:
如图,在
中,
为
的直径,
为
的弦,点
是
的中点.
尺规作图:过点
作
的垂线交
于点
,垂足为点
,连接
、
.(只保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/bc71fe5f-8e9c-4521-b2da-346e683ce43c.png?resizew=167)
求证:
.
证明: ∵点E是
的中点
∴
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2dc43da399974bd1df3b93f4e3104.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85b76335da132aae0a00587cc0d980c.png)
∵
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b40d65f77afa7e51a0f3e5b38f628.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dece4378e703f9654c81d3cd083b599.png)
∴
∴
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d24eae99b6dba16a45b58a6ff327a7b.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52957bb1727c575b3cf8678a09db500c.png)
∴
∴
.
如图,在
![](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/3d97cdc586744d208b6f69c9813af977.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
尺规作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/bc71fe5f-8e9c-4521-b2da-346e683ce43c.png?resizew=167)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ea7de08b6f98a9a9b28f983052f3c6.png)
证明: ∵点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975fe31b3d4f552faabb68c4c40881e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2dc43da399974bd1df3b93f4e3104.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85b76335da132aae0a00587cc0d980c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab827ebee09efe2dee1d7b6a4d6884.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b40d65f77afa7e51a0f3e5b38f628.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dece4378e703f9654c81d3cd083b599.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6217ba54baf35aca59d9b89ded7367e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975fe31b3d4f552faabb68c4c40881e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d24eae99b6dba16a45b58a6ff327a7b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52957bb1727c575b3cf8678a09db500c.png)
∴
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ea7de08b6f98a9a9b28f983052f3c6.png)
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解答题-作图题
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【推荐2】如图,在
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