如图,
为⊙
的直径,点
是⊙
上一点,过点
的直线交
的延长线于点
.作
,垂足为点
,已知
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b04de00b-0a44-48a5-b3fe-cd775cd1352d.png?resizew=214)
(1)求证:
是⊙
的切线;
(2)若
,
,求⊙
的半径.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b33dddf09abfbd05cd35683b2b70ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94d2506539ad8760cf7ed366c0c537c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/b04de00b-0a44-48a5-b3fe-cd775cd1352d.png?resizew=214)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594c95ec1d027b7fa228f341d0b253a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61348e4bd81707e2e3f6f18303276c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
2023·安徽合肥·一模 查看更多[5]
2023年安徽省合肥市南岗中学中考一模数学试卷(已下线)黄金卷05(滨州专用)-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷2023年吉林省松原市宁江区中考一模数学试题2023年江西省吉安县初中数学学业水平模拟测试安徽省合肥市长丰县埠里中学2022-2023学年九年级下学期月考数学试题
更新时间:2023-03-23 09:10:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,⊙
是
的外接圆,且
,四边形
是平行四边形,边
与⊙
交于点
,连接
.
0
(1)求证:
;
(2)若
,求证:点
是
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712454832193536/2713834357104640/STEM/e945d0cd0d9b4de2a1f10475e5827c6b.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282836891c171f38f62306a52106fd32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
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【推荐2】如图,AC、BD是⊙O的直径,且AC⊥BD,请说明四边形ABCD是正方形.
![](https://img.xkw.com/dksih/QBM/2020/9/27/2558561774813184/2565384038924288/STEM/4cd0d246b4d74ec9a088f34cf987a312.png?resizew=126)
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【推荐1】如图,在 ABCD中,∠D=60°,对角线AC⊥BC,⊙O经过点A,B,与AC交于点M,连接AO并延长与⊙O交于点F,与CB的延长线交于点E,AB=EB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/81c94b16-4449-4557-b323-4210bf447de9.png?resizew=236)
(1)求证:EC是⊙O的切线;
(2)若AD=2
,求扇形OAM的面积(结果保留π).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/81c94b16-4449-4557-b323-4210bf447de9.png?resizew=236)
(1)求证:EC是⊙O的切线;
(2)若AD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图,AB为⊙O的直径,C,D为⊙O上的两点,∠BAC=∠DAC,过点C作直线EF⊥AD,交AD的延长线于点E,连接BC.
(1)求证:EF是⊙O的切线;
(2)若∠BAC=∠DAC=30°,BC=2,则图中阴影部分面积为 .
(1)求证:EF是⊙O的切线;
(2)若∠BAC=∠DAC=30°,BC=2,则图中阴影部分面积为 .
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630255732269056/2633312122519552/STEM/774df928-bbdd-44f3-9341-1d77e6b31138.png?resizew=227)
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适中
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【推荐1】某数学兴趣小组在数学实践课上开展了“菱形折叠”研究活动.
第一步:每人制作边长都为7的菱形纸片若干个,四个顶点为A、B、C、D(为保持一致,活动中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca5f6366db8d915043332f818b65d7c.png)
小组内制作图形各点名称命名规则相同);
第二步∶在边
上分别取点M、N(不含端点),将四边形
沿
翻折,使线段
的对应线段
经过顶点 D(点A、B分别与点 E、F对应).
操作判断![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a96d1e67d5e74d6122c8dfa63f183.png)
则
______.
迁移探究
(2)缜密小组按上述步骤折叠后如图2所示,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8861f0a5a206281022132864219f34d.png)
求
的长;
拓展延伸
(3)创新小组按上述步骤折叠后,要使
是以
为直角边的直角三角形,请你在图3 中帮他们画出满足条件的图形(草图即可),并求出对应的
的长.
第一步:每人制作边长都为7的菱形纸片若干个,四个顶点为A、B、C、D(为保持一致,活动中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca5f6366db8d915043332f818b65d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
第二步∶在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa76cfd79a2ff6b28f370e54f4eb51d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
操作判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a96d1e67d5e74d6122c8dfa63f183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf86f352a109022b6a849690bd0def8b.png)
迁移探究
(2)缜密小组按上述步骤折叠后如图2所示,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8861f0a5a206281022132864219f34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c915b4ce31fabfd4703c547291ad9277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
拓展延伸
(3)创新小组按上述步骤折叠后,要使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44ca79d5e12bd02c393ba7f0b31c8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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名校
【推荐2】如图,直线
:
分别交反比例函数
、反比例函数
的图象于点
,B点C为第四象限内一点,
与x轴交于点D,
与y轴交于E,且
,
轴,已知
.
(1)求k的值;
(2)求
时,x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9cfcb262fce0eb135e52ed3b98df0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a1a832b05f6a8a0c3847587ff88fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2813f209f75cf54a185876480dd4d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ce0676a7421d3530341da87f61fc7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d51fa2414dbedc6b24777b28a796c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275957c02502eb136bc989a88bc8be8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/3b9e8916-b917-47ab-8479-ba694f9db6bc.png?resizew=179)
(1)求k的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81392d28b95bb2666ca8ad3dc89f6c77.png)
您最近一年使用:0次