名校
1 . 等腰
绕点C顺时针旋转,旋转角度为β,得到等腰
.线段
与直线
交于点M,连
.
(1)如图1,点B的对应点E恰好落在线段
上.
猜想:
与
的数量关系为 ,线段
与
的位置关系为 ;
(2)探究:当
时,线段
的长度的最大值和最小值分别是多少?
(3)拓展:当旋转到如图2所示位置时,(1)中的结论是否仍然成立;若成立,证明你的结论;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d37ccd935af060538b11eaeb7550f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdd83352f65446c38e118b0387fe7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/0e7c1b1e-089b-4599-8a3f-c92477399e51.jpg?resizew=325)
(1)如图1,点B的对应点E恰好落在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)探究:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799cd63abe4274a6c673c4effdbfc2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展:当旋转到如图2所示位置时,(1)中的结论是否仍然成立;若成立,证明你的结论;若不成立,请说明理由.
您最近一年使用:0次
2 . (1)问题背景:在四边形
中,
,
交
延长线于点E.如图1,求证:
;
(2)问题探究:如图1,若
,
,
,求
;
(3)延伸拓展:如图2,在四边形
中,
,
°,
,直接写出
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2190970b1e2e397896d445b4138fe34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a2dff3926d1e3df8f2cad313404833.png)
(2)问题探究:如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3b3d73ff96882a0fb4d025ecc5669d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)延伸拓展:如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3138c473e20da470407deeb300830d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f406d2c181c5ac6dde0d208c1b235c26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07943aba85bf1d3275e5c91dbb28620.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/b15c35c1-d9da-4f50-a79b-f61bb5832010.png?resizew=307)
您最近一年使用:0次
名校
3 . 综合与探究
【问题情境】
如图1,在
中,
,
,点
,
分别在边
,
上,且
.
【数学思考】
(1)在图1中,
的值为________;
(2)图1中
保持不动,将
绕点
按逆时针方向旋转到图2的位置,其它条件不变,连接
,
,则(1)中的结论是否仍然成立?并说明理由;
【拓展探究】
(3)在图2中延长
,分别交
,
于点
,
,连接
,得到图3,
与
之间的数量关系为________________;
(4)若将
绕点
按逆时针方向旋转到图4的位置,连接
,
,延长
交
的延长线于点
,
交
于点
,则(3)中的结论是否仍然成立,若成立,请说明理由;若不成立,请直接写出
与
之间的数量关系.
【问题情境】
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
【数学思考】
(1)在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
(2)图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【拓展探究】
(3)在图2中延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcf0b442d5ff2ce8efa1a778b4ecd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(4)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcf0b442d5ff2ce8efa1a778b4ecd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/f36ed679-9736-4c78-8059-d476e842a2de.png?resizew=523)
您最近一年使用:0次
4 . 【给出问题】:已知:
是正方形
的外接圆,点
在
上
除
、
外),试求
的度数.
【分析问题】:善于思考的小明在分析上述题目后,有了以圆为工具来解决问题的思路.用圆来画出准确的示意图就能顺利解题了,在此基础上进一步探索就有了新发现.请善于思考的你帮助解答以下问题:
(1)①尺规作图,在
中作出内接正方形
.(保留痕迹,不写作法)
②原题中
______________;
【深入思考】:(2)【问题】如图
,若四边形
是
的内接正方形,点
为弧
上一动点,连接
、
、
、
,请探究
、
、
三者之间或者
、
、
三者之间有何数量关系,并给予证明.
(3)【拓展】如图2,若六边形
是
的内接正六边形,点
为弧
上一动点,请探究
、
、
三者之间有何数量关系:_____________________________________.(不写证明过程).
(4)【应用】如图3,若四边形
是矩形,点
为边
上一点,
,
,
,试求矩形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ed5e3d39698f7c4d8369ed8a76a09c.png)
【分析问题】:善于思考的小明在分析上述题目后,有了以圆为工具来解决问题的思路.用圆来画出准确的示意图就能顺利解题了,在此基础上进一步探索就有了新发现.请善于思考的你帮助解答以下问题:
(1)①尺规作图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
②原题中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31caa2b7573adec114105223d5cd052.png)
【深入思考】:(2)【问题】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/1c7af543-cde5-458f-ae09-f05eefb3cc81.png?resizew=126)
(3)【拓展】如图2,若六边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019c0405370c673e37b46c066eba839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/e01e787a-180d-4cc0-8f5e-4347a0f81dbd.png?resizew=158)
(4)【应用】如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94a73d65aa3a49b3ac2e618770d0bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f9651b17b98d75a87a7e502202d32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222cead0c4b6c1e2f0e333dfb54ec44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/a571f8ab-8f7d-4a6f-979a-cfdd0610b9b9.png?resizew=114)
您最近一年使用:0次
真题
5 . 探究与实践
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
提出问题:
如图1,在线段
同侧有两点
,
,连接
,
,
,
,如果
,那么
,
,
,
四点在同一个圆上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/62944a57-9ea7-4ef5-bba8-c5734d4aab69.png?resizew=136)
探究展示:
如图2,作经过点
,
,
的
,在劣弧
上取一点
(不与
,
重合),连接
,
则
(依据1)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/41dc252b-b9a1-4e43-9a45-5789b1d40fb3.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826527c10e6d04009ca7f3313163d34.png)
点
,
,
,
四点在同一个圆上(对角互补的四边形四个顶点共圆)
点
,
在点
,
,
所确定的
上(依据2)
点
,
,
,
四点在同一个圆上
(1)反思归纳:上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1:__________;依据2:__________.
(2)图3,在四边形
中,
,
,则
的度数为__________.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/17ce3ed3-87d4-4246-b211-3e612f0a8911.png?resizew=158)
(3)拓展探究:如图4,已知
是等腰三角形,
,点
在
上(不与
的中点重合),连接
.作点
关于
的对称点
,连接
并延长交
的延长线于
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/14db9254-d49d-4255-84aa-68775757d6a7.png?resizew=182)
①求证:
,
,
,
四点共圆;
②若
,
的值是否会发生变化,若不变化,求出其值;若变化,请说明理由.
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
提出问题:
如图1,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/62944a57-9ea7-4ef5-bba8-c5734d4aab69.png?resizew=136)
探究展示:
如图2,作经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c193e68966879232ca0c83281bfd32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/41dc252b-b9a1-4e43-9a45-5789b1d40fb3.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba51168da9382b9e573fcc4a88b6268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826527c10e6d04009ca7f3313163d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)反思归纳:上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1:__________;依据2:__________.
(2)图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8889aad264f6d356c3f8bebe7d92e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/17ce3ed3-87d4-4246-b211-3e612f0a8911.png?resizew=158)
(3)拓展探究:如图4,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/1/14db9254-d49d-4255-84aa-68775757d6a7.png?resizew=182)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e52911a1ce4e7aab20151eb49322cd.png)
您最近一年使用:0次
2022-06-30更新
|
1424次组卷
|
6卷引用:2022年贵州省遵义市中考数学真题
2022年贵州省遵义市中考数学真题(已下线)专题20 与圆相关的压轴题-2022年中考数学真题分项汇编(全国通用)(第2期)(已下线)第一节 圆的性质及其证明与计算03综合测2023年山西省朔州市怀仁市中考一模数学试题(已下线)2023年贵州省中考数学真题变式题22-25题(已下线)24.4(培优课)辅助圆、隐圆(题型精讲精练)-【题型分类精粹】2023-2024学年九年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)
名校
6 . 定义:有一组邻边相等且对角互补的四边形叫做等补四边形.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963888987521024/2965084467789824/STEM/9fe0741c-dfa6-40db-884f-a1b22d691d40.png?resizew=457)
(1)【问题理解】
如图1,在☉O上有三个点A、B、C,连接AB、BC.现要在☉O上再取一点D,使得四边形ABCD是等补四边形,请写出点D的一种取法,并证明你得到的四边形ABCD是等补四边形.
(2)【拓展探究】
如图2,在等补四边形ABCD中,AB=AD
①已知BC:CD=7:4,△ACD的面积为8,则四边形ABCD的面积为 ;
②连接AC,请在图中找出一组具有相等关系的角,并证明你的结论.
(3)【问题解决】
如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F.若CD=7,DF=3,且AF的长.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963888987521024/2965084467789824/STEM/9fe0741c-dfa6-40db-884f-a1b22d691d40.png?resizew=457)
(1)【问题理解】
如图1,在☉O上有三个点A、B、C,连接AB、BC.现要在☉O上再取一点D,使得四边形ABCD是等补四边形,请写出点D的一种取法,并证明你得到的四边形ABCD是等补四边形.
(2)【拓展探究】
如图2,在等补四边形ABCD中,AB=AD
①已知BC:CD=7:4,△ACD的面积为8,则四边形ABCD的面积为 ;
②连接AC,请在图中找出一组具有相等关系的角,并证明你的结论.
(3)【问题解决】
如图3,在等补四边形ABCD中,AB=AD,其外角∠EAD的平分线交CD的延长线于点F.若CD=7,DF=3,且AF的长.
您最近一年使用:0次
2022-04-24更新
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298次组卷
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3卷引用:2022年山东省青岛市市南区中考数学一模试题
7 . 综合与实践
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/602d4895-7001-4f76-b012-fa1083210bf7.png?resizew=571)
提出问题:
如图1,在线段AC同侧有两点B,D,连接
,如果
,那么A,B,C,D四点在同一个圆上.
探究展示:求证:点A,B,C,D四点在同一个圆上
如图2,作经过点A,C,D的
,在劣弧
上取一点E(不与A,C重合),连接
,
,则
.
(1)请完善探究展示
(2)如图3,在四边形
中,
,则∠4的度数为 .
(3)拓展探究:如图4,已知
是等腰三角形,
,点D在
上(不与
的中点重合),连接
.作点C关于
的对称点E,连接
并延长交
的延长线于F,连接
.
①求证:A,D,B,E四点共圆;
②若
,
的值是否会发生变化,若不变化,求出其值;若变化,请说明理由
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/602d4895-7001-4f76-b012-fa1083210bf7.png?resizew=571)
提出问题:
如图1,在线段AC同侧有两点B,D,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569e4971fea4e0b03da9c49ee5bdfa61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
探究展示:求证:点A,B,C,D四点在同一个圆上
如图2,作经过点A,C,D的
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c193e68966879232ca0c83281bfd32.png)
(1)请完善探究展示
(2)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e1441aa782f4078c3303d7fc6526cc.png)
(3)拓展探究:如图4,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a56dec16d1d3b76a2a292293d09907e.png)
①求证:A,D,B,E四点共圆;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e52911a1ce4e7aab20151eb49322cd.png)
您最近一年使用:0次
2023-01-17更新
|
158次组卷
|
2卷引用:浙江省宁波市鄞州区2022-2023学年九年级上学期期末数学试题
2022九年级·全国·专题练习
名校
8 . 综合与实践
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/1/ab01b5e2-0e99-4bb3-8f00-6bc553f3751a.png?resizew=486)
提出问题:
如图1,在线段AC同侧有两点B,D,连接AD,AB,BC,CD,如果∠B=∠D,那么A,B,C,D四点在同一个圆上.
探究展示:
如图2,作经过点A,C,D的⊙O,在劣弧AC上取一点E(不与A,C重合),连接AE,CE,则∠AEC+∠D=180°(依据1)
∵∠B=∠D
∴∠AEC+∠B=180°
∴点A,B,C,E四点在同一个圆上(对角互补的四边形四个顶点共圆)
∴点B,D在点A,C,E所确定的⊙O上(依据2)
∴点A,B,C,D四点在同一个圆上
(1)上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1: ;依据2: .
(2)如图3,在四边形ABCD中,∠1=∠2,∠3=45°,则∠4的度数为 .
拓展探究:
(3)如图4,已知△ABC是等腰三角形,AB=AC,点D在BC上(不与BC的中点重合),连接AD.作点C关于AD的对称点E,连接EB并延长交AD的延长线于F,连接AE,DE.
①求证:A,D,B,E四点共圆;
②若AB=2
,AD•AF的值是否会发生变化,若不变化,求出其值;若变化,请说明理由
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/1/ab01b5e2-0e99-4bb3-8f00-6bc553f3751a.png?resizew=486)
提出问题:
如图1,在线段AC同侧有两点B,D,连接AD,AB,BC,CD,如果∠B=∠D,那么A,B,C,D四点在同一个圆上.
探究展示:
如图2,作经过点A,C,D的⊙O,在劣弧AC上取一点E(不与A,C重合),连接AE,CE,则∠AEC+∠D=180°(依据1)
∵∠B=∠D
∴∠AEC+∠B=180°
∴点A,B,C,E四点在同一个圆上(对角互补的四边形四个顶点共圆)
∴点B,D在点A,C,E所确定的⊙O上(依据2)
∴点A,B,C,D四点在同一个圆上
(1)上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1: ;依据2: .
(2)如图3,在四边形ABCD中,∠1=∠2,∠3=45°,则∠4的度数为 .
拓展探究:
(3)如图4,已知△ABC是等腰三角形,AB=AC,点D在BC上(不与BC的中点重合),连接AD.作点C关于AD的对称点E,连接EB并延长交AD的延长线于F,连接AE,DE.
①求证:A,D,B,E四点共圆;
②若AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
您最近一年使用:0次
2022-12-30更新
|
292次组卷
|
4卷引用:重难点04与圆相关的位置关系(11种模型)-2022-2023学年九年级数学考试满分全攻略(人教版)
(已下线)重难点04与圆相关的位置关系(11种模型)-2022-2023学年九年级数学考试满分全攻略(人教版)江苏省扬州市仪征市第三中学2022-2023学年九年级下学期第一次月考数学试题2023年江苏省淮安市淮安区中考一模数学试题(已下线)重难点02“四点共圆”模型-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)
名校
9 . 问题情境:如图1,在△ABC中,AB=6,AC=5,点D,E分别在边AB,AC上,且
.数学思考:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/c5b159a7-451a-4969-900c-7987bd79c38a.png?resizew=605)
(1)在图1中,
的值为 ;
(2)图1中△ABC保持不动,将△ADE绕点A按逆时针方向旋转到图2的位置,其它条件不变,连接BD,CE,则(1)中的结论是否仍然成立?并说明理由;
(3)拓展探究:在图2中,延长BD,分别交AC,CE于点F,P,连接AP,得到图3,探究∠APE与∠ABC之间有何数量关系,并说明理由;
(4)若将△ADE绕点A按逆时针方向旋转到图4的位置,连接BD,CE,延长BD交CE的延长线于点P,BP交AC于点F,则(3)中的结论是否仍然成立,若成立,请说明理由;若不成立,请直接写出∠APE与∠ABC之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/c5b159a7-451a-4969-900c-7987bd79c38a.png?resizew=605)
(1)在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
(2)图1中△ABC保持不动,将△ADE绕点A按逆时针方向旋转到图2的位置,其它条件不变,连接BD,CE,则(1)中的结论是否仍然成立?并说明理由;
(3)拓展探究:在图2中,延长BD,分别交AC,CE于点F,P,连接AP,得到图3,探究∠APE与∠ABC之间有何数量关系,并说明理由;
(4)若将△ADE绕点A按逆时针方向旋转到图4的位置,连接BD,CE,延长BD交CE的延长线于点P,BP交AC于点F,则(3)中的结论是否仍然成立,若成立,请说明理由;若不成立,请直接写出∠APE与∠ABC之间的数量关系.
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2022-05-08更新
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328次组卷
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4卷引用:山西省长治市长子县2021-2022学年九年级上学期期末数学试题
10 . 已知正方形
,
,
为平面内两点.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958609887952896/2963050131939328/STEM/2dabeccc-2672-490f-81fa-f6811bffeb6e.png?resizew=406)
(1)【探究建模】如图1,当点
在边
上时,
,且
,
,
三点共线,求证:
;
(2)【类比应用】如图2,当点
在正方形
外部时,
,
,且
,
,
三点共线,猜想并证明线段
,
之间的数量关系;
(3)【拓展迁移】如图3,当点
在正方形
外部时,
,
,
,且
,
,
三点共线,
与
交于点
.若
,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958609887952896/2963050131939328/STEM/2dabeccc-2672-490f-81fa-f6811bffeb6e.png?resizew=406)
(1)【探究建模】如图1,当点
![](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/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)【类比应用】如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【拓展迁移】如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113ac6e656002f2d110f08ed753e9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6b9ccc3a025e4f11717cfd7ab354b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc95af9238cf516b1f60fd4c51b409a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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