如图,⊙O的内接四边形ABCD两组对边的延长线分别交于点E、F.
![](https://img.xkw.com/dksih/QBM/2015/7/24/1573885679255552/1573885685506048/STEM/ffa560c3f06348e0b353435ddb545ed7.png)
(1)若∠E=∠F时,求证:∠ADC=∠ABC;
(2)若∠E=∠F=42°时,求∠A的度数;
(3)若∠E=α,∠F=β,且α≠β.请你用含有α、β的代数式表示∠A的大小.
![](https://img.xkw.com/dksih/QBM/2015/7/24/1573885679255552/1573885685506048/STEM/ffa560c3f06348e0b353435ddb545ed7.png)
(1)若∠E=∠F时,求证:∠ADC=∠ABC;
(2)若∠E=∠F=42°时,求∠A的度数;
(3)若∠E=α,∠F=β,且α≠β.请你用含有α、β的代数式表示∠A的大小.
2015·广东佛山·中考真题 查看更多[17]
2015年初中毕业升学考试(广东佛山卷)数学2016届江苏省高邮市澄阳初级中学九年级上学期第一次月考数学试卷江西省赣州市信丰县2017年普通高中提前招生考试数学试题北师大版九年级数学下册_第三章_圆_单元检测试卷1【校级联考】江西省赣州市宁都县2019届九年级上学期期中考试数学试题江苏省扬州市宝应县2019年九年级上学期10月月考数学试题(已下线)【万唯原创】2016年安徽省中考数学-面对面-第六单元26广东省甲东中学2020-2021学年九年级上学期第二次月考数学试题(已下线)练习5 圆内接四边形的性质-2020-2021学年【补习教材·寒假作业】九年级数学(苏科版)江苏省扬州市宝应实验初中、仪征实验初中等六校2020-2021学年九年级上学期12月月考数学试题(已下线)第二章 对称图形-圆单元检测卷(难)-2021-2022学年苏科版九年级数学上册同步单元检测山东省聊城市阳谷县2021-2022学年九年级上学期期中数学试题(已下线)第3章 圆的基本性质(B卷·能力提升练)-【单元测试】2022-2023学年九年级数学上册分层训练AB卷(浙教版)(已下线)专题24.27 正多边形与圆(知识讲解)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)第15课 圆内接四边形-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(浙教版)(已下线)广东省广州市第一中学2022—2023学年九年级上学期数学期末试卷变式题16-20京改版九年级数学上册第21章 圆(上) 单元测试卷
更新时间:2019-01-30 18:14:09
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解答题-证明题
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【推荐1】如图,在
与
中,
,
,
.
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/da0d90f3-7f7c-4813-845d-b81606b942ae.png?resizew=145)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/da0d90f3-7f7c-4813-845d-b81606b942ae.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e0e554b89644d787a2eeec4b130c5a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
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【推荐2】根据以下所给的材料,解答下面的问题.
材料一:如图1,
中,若
,则
.
材料二:如图2,
的内角
和外角
的平分线交于点
,则有结论:
.
解答问题:
如图3,点
与点
坐标轴上,且
,
满足
.
(1)求
,
的坐标;
(2)
为
轴正半轴上一动点,
为
中
的外角平分线与
的平分线的交点,问是否存在点
,使
.若存在,求
点坐标;
(3)如图4,
为
轴正半轴上
的上方一动点,
为线段
上一动点,连
延长交
轴于
,
和
平分线交于
,点
在运动过程中
的值是否发生变化?若不变,求其值;若变化,求其变化范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/11/fee3dc34-d83e-48d9-bfde-f199ce02120f.png?resizew=507)
材料一:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
材料二:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88a9cfcd84fde150e2bcfa65c5e3546.png)
解答问题:
如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c17110dba6a1ddf771e188afa8218a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887acafd03554546c63379f07b895265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729cc284454d4b9b8812305d8bd2954d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff36ac07c45c8d03cf3b7d8739c517ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ee72b8942479ea23b5246d83c1609e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1e2a60c37ebc303d4fc2bf3d6a234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867ec86e05023be2ca596eba7ab46d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f5f26aac7197d42a41081fb1fda0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2d1456ac737a90666e75ae34198411.png)
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【推荐1】如图,以
的边
为直径的
交
于点D,并与
相切,点E为弧
上一点(不与点B、D重合),连接
,过点A作
的垂线,交
的延长线于点F,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/ab92481f-c494-4aa7-91b5-2cab2c189403.png?resizew=166)
(1)求证:
;
(2)延长
、
交于点G,求证:四边形
是矩形;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/ab92481f-c494-4aa7-91b5-2cab2c189403.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0502e241fe426eb3ebd1f5a28167530f.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
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【推荐2】如图,在
中,
是弧
的中点,
为
上的一动点(
与
在
异侧),连接
交
于点
,
(
是
的半径).
(1)
为
延长线上一点,若
,证明:直线
与
相切;
(2)求
的值(用
表示).
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36485a6242a9df4da94c396478a5fc09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/a8c90477-715f-4b48-a6a3-b020e040dc04.png?resizew=182)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c91348119d864bf3e59098e837abd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676be1538a4c851eafacb08f2a2fee2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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【推荐1】如图,四边形
内接于
,
为
的直径,过点
作
交
的延长线于点
,延长
,交
的延长线于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/da85460e-2c23-41e8-88c1-b4eedb9dab35.png?resizew=131)
(1)
与
的关系为___________;
(2)求证:
为
的切线;
(3)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8774186256616aacccda3f7a3e0ef437.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/da85460e-2c23-41e8-88c1-b4eedb9dab35.png?resizew=131)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42b59b76eafbbe36f13b2daa60132c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】阅读以下材料,并按要求完成相应的任务.
“圆材埋壁”是我国古代数学著作《九章算术》中的一个问题:今有圆材,埋在壁中,不知大小,以锯锯之,深一寸,锯道长一尺,问径几何?用现在的数学语言表达是:如图,
为
的直径,弦
,垂足为
,
寸,
尺,其中1尺
寸,求出直径
的长.
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420720299548672/2420943871729664/STEM/ed58b31a1f8e410bb418a1935904e113.png?resizew=121)
解题过程如下:
连接
,设
寸,则
寸.
∵
尺,∴
寸.
在
中,
,即
,解得
,
∴
寸.
任务:
(1)上述解题过程运用了 定理和 定理.
(2)若原题改为已知
寸,
尺,请根据上述解题思路,求直径
的长.
(3)若继续往下锯,当锯到
时,弦
所对圆周角的度数为 .
“圆材埋壁”是我国古代数学著作《九章算术》中的一个问题:今有圆材,埋在壁中,不知大小,以锯锯之,深一寸,锯道长一尺,问径几何?用现在的数学语言表达是:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3c450315612a9fa3fc9562f290bc04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420720299548672/2420943871729664/STEM/ed58b31a1f8e410bb418a1935904e113.png?resizew=121)
解题过程如下:
连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428e670f658a4e769388d20b4b30ecfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea395a5323355cac24ed78d9e2d722e.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac45d5faec9e6b7babe663072c459715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb167275de6e9e4c58a5e7d17e9c9ba.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e8f8763dbcf09bc67d36c33bf381d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513eefd32c2cf5edaed45b2b14a8f2a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fed59242bb972ee3325693e0ba4e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea2698318a6a486347828687fd35017.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0c54eebfd8b5faa55d982dfee864a0.png)
任务:
(1)上述解题过程运用了 定理和 定理.
(2)若原题改为已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587ff8b7fbfbd7c8091f667e5c880dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)若继续往下锯,当锯到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf79b050df52274a0ad72baee610172f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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