名校
1 . 在
中,
,
,点
是
的中点,点
是射线
上的一个动点(点
不与点
、
、
重合),过点
作
于点
,过点
作
于点
,连接
,
.
【问题探究】如图1,当P点在线段
上运动时,延长
交
于点G.
(1)求证:
;
(2)求
与
的数量关系并说明理由.
【拓展延伸】
(3)①如图2,当P点在线段
上运动,
的延长线与
的延长线交于点
,
的大小是否变化?若不变,求出
的度数;若变化,请说明理由;
②当
点在射线
上运动时,若
,
,直接写出
的面积,不需证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4398a409532d9a2a7504f91c5be1b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d551b53d8b6d675267f4d1cfad476855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/f524c381-ded2-40ef-b8f6-2ef2ebc1a03c.png?resizew=457)
【问题探究】如图1,当P点在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d549280a7d4b3a9267cc6a3bc8b3473d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
【拓展延伸】
(3)①如图2,当P点在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844e53c7d52eb738259e997d5c99b6ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844e53c7d52eb738259e997d5c99b6ba.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/002767b8780fc8bf7aafc7beb2bae1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926b737b11722b88fd40fc8eef8ecba1.png)
您最近一年使用:0次
2 . 【问题情境】
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/39598fc2-ae43-4538-be61-6743a568c228.png?resizew=506)
利用角平分线构造全等三角形是常用的方法,如图1,OP平分
.点A为OM上一点,过点A作
,垂足为C,延长AC交ON于点B,可根据ASA证明
,则
,
(即点C为AB的中点).
【问题探究】
如图2,
中,
,
,CD平分
,
,垂足E在CD的延长线上,试探究BE和CD的数量关系,并证明你的结论:
【拓展延伸】
如图3,
中,
,
,点D在线段BC上,且
,
于E,DE交AB于F,试探究BE和DF之间的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/39598fc2-ae43-4538-be61-6743a568c228.png?resizew=506)
利用角平分线构造全等三角形是常用的方法,如图1,OP平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a2fe360dbaf805c6b8bff7b07c1dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febeafb130cbafbed0e6ce3599199ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
【问题探究】
如图2,
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
【拓展延伸】
如图3,
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f4539785f39a7d09edc3261185850a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.png)
您最近一年使用:0次
2022-07-11更新
|
226次组卷
|
4卷引用:内蒙古自治区鄂尔多斯市准格尔旗2021-2022学年八年级上学期期末数学试题
内蒙古自治区鄂尔多斯市准格尔旗2021-2022学年八年级上学期期末数学试题(已下线)专题1.60 《三角形的初步知识》全章复习与巩固(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)河南省漯河市临颍县2022-2023学年八年级上学期期中数学试题河南省周口市扶沟县2023-2024学年八年级上学期期中数学试题
名校
3 . 某学习小组在探究三角形全等时,发现了下面这种典型的基本图形.如图1,已知:在
中,
,
,直线l经过点A,
直线l,
直线l,垂足分别为点D,E.
(1)问题发现
___;
___;
___;
___;
(2)类比探究
求证:
.
(3)拓展延伸
组员小明想,如果三个角不是直角,那么(2)中的结论是否还成立呢?如图2若将题中的条件改为:在
中,
,D,A,E三点都在直线l上,并且有
,其中
为任意锐角或钝角.请问结论
是否成立?若成立,请你给出证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/21ef06a0-d4db-484b-9aa4-5229049822a4.png?resizew=361)
(1)问题发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5277fa450a0c513a86a74420f8ee99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26810ed73e5463c996616b2e71ba797e.png)
(2)类比探究
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb773a664fa72fc5d8fe377e9f891901.png)
(3)拓展延伸
组员小明想,如果三个角不是直角,那么(2)中的结论是否还成立呢?如图2若将题中的条件改为:在
![](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/e1cf8edbd31ff7e27c784c8688b537a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb773a664fa72fc5d8fe377e9f891901.png)
您最近一年使用:0次
名校
4 . 【思考研究】
“如图1,在正方形
中,E是对角线AC上一点,点F在DC的延长线上,且
,EF交BC于点G,求证:
.”小贤在研究这个问题时,写出了如下的分析过程:
先证
,得到
,再由
,得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/66dc70a3-4472-47f9-994f-265fd96d963c.png?resizew=422)
(1)请根据小贤的分析过程证明
.
【解决问题】
(2)求
的度数.
【拓展延伸】
(3)如图2,把正方形
改为菱形
,其他条件不变,当
时,连接BF,试探究线段DE与线段BF的数量关系,并说明理由.
“如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
先证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fc3b7868d47ab15409663893c55bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076a5273440d800b96bfcaaa9970cc45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/66dc70a3-4472-47f9-994f-265fd96d963c.png?resizew=422)
(1)请根据小贤的分析过程证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
【解决问题】
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
【拓展延伸】
(3)如图2,把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
您最近一年使用:0次
2023-03-07更新
|
206次组卷
|
2卷引用:江西省景德镇一中2022-2023学年九年级上学期数学期末检测题
5 . 综合与探究
问题背景:
中,E,N分别是
,
上的两点,连接
,
.若
,则
的值为____________.
②如图2,在矩形
中,E是
上的一点,N是
上一点,连接
.若
,且
,则
的值为____________.
问题探究:
(2)如图3,在矩形
中,E为边
上的动点,F为边
上的动点,M为边
上的动点,连接
,过点M作
于点O,交边
于点N.若
,求
的值.
问题拓展:
(3)如图4,把(2)中的条件改为“在四边形
中,
,点F与点C重合,点M与点B重合,
”,请直接写出
的值.
问题背景:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1416b61db461d134ce7b0532055a6059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db58459b5cbd0ed56911b8766b32280b.png)
②如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50eba808652e51674d10f7180660c7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1416b61db461d134ce7b0532055a6059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19592a5eaacb7752f792d43652b43db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db58459b5cbd0ed56911b8766b32280b.png)
问题探究:
(2)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851b5e53821ac0601c61a1dd694b3904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb06166350f86c242fc49ce2a7bed94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba86ae4e81041a4237cb5cd98b55b9fd.png)
问题拓展:
(3)如图4,把(2)中的条件改为“在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84be06cb340fab980b3a18db14544e95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b0e8d6874ca0163575176a49accf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba86ae4e81041a4237cb5cd98b55b9fd.png)
您最近一年使用:0次
2023-02-28更新
|
127次组卷
|
3卷引用:河南省新乡市封丘县2022-2023学年九年级上学期期末数学试题
6 . 【阅读理解】如图1,
为等边
的中心角,将
绕点
逆时针旋转一个角度
,
的两边与三角形的边
,
分别交于点
,
.设等边
的面积为
,通过证明可得
,则
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/6f0871d9-ed4c-4400-b344-ec338c4864b3.png?resizew=593)
(1)【类比探究】如图2,
为正方形
的中心角,将
绕点
逆时针旋转一个角度
,
的两边与正方形的边
,
分别交于点
,
.若正方形
的面积为
,请用含
的式子表示四边形
的面积(写出具体探究过程).
(2)【拓展应用】如图3,
为正六边形
的中心角,将
绕点
逆时针旋转一个角度
,
的两边与正六边形的边
,
分别交于点
,
.若四边形
面积为
,请直接写出正六边形
的面积
(3)【猜想结论】如图4,
为正
边形
……的中心角,将
绕点
逆时针旋转一个角度
,
的两边与正
边形的边
,
分别交于点
,
.若四边形
面积为
,请用含
、
的式子表示正
边形
……的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5059e2fab256a65adc08d7df587648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7efb23a3197f355621e7ecba6fc03b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7951ed093a5a53c0900360cd0cac88.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/6f0871d9-ed4c-4400-b344-ec338c4864b3.png?resizew=593)
(1)【类比探究】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb1aa7bc4a01962fc1297f17fa9128f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c96be64764f0c4200e8b1413ac231d.png)
(2)【拓展应用】如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1558b64bcfa578b6b5f251f62b0489b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c96be64764f0c4200e8b1413ac231d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
(3)【猜想结论】如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fb9deda6adf640bc45addaf7ad60f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c96be64764f0c4200e8b1413ac231d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
您最近一年使用:0次
2023-02-24更新
|
152次组卷
|
4卷引用:山西省阳泉市郊区2022-2023学年九年级上学期期末教学质量监测数学试题
山西省阳泉市郊区2022-2023学年九年级上学期期末教学质量监测数学试题(已下线)猜想03旋转综合题(3种常见题型专练)-2023-2024学年九年级数学上学期期末考点大串讲(人教版)(已下线)专题2.31 正多边形与圆(分层练习)-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24.30 正多边形和圆(分层练习)-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)
7 . 【特例证明】
如图1,
平分
,点A为
上一点,过点A作
,垂足为C,延长
交
于点B.求证:
,
.
【类比探究】
如图2,
中,
,
,
平分
,
,垂足E在
的延长线上,试探究
和
的数量关系,并证明你的结论;
【拓展运用】
如图3,
中,
,
,点D在线段
上,且
,
于E,
交
于F,试探究
和
之间的数量关系,并证明你的结论.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a2fe360dbaf805c6b8bff7b07c1dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f2a8a3a38ec4119d5e1016dd04f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
【类比探究】
如图2,
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【拓展运用】
如图3,
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f4539785f39a7d09edc3261185850a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c182a9d9fd0a7023b710cd671d9468e7.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/86722976-9766-4cf0-91af-d052bd74ee91.png?resizew=506)
您最近一年使用:0次
8 . 背景:如图,已知
是等边三角形,点
在边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/ede495da-9534-47ee-ac8e-5e9df6a71ef0.png?resizew=318)
探究:如图(1),在直线
上取点
,使得
,可以在图中添加适当的线段,构造与
全等的三角形.
(1)用尺规在图(1)中构造一个与
全等的三角形,保留作图痕迹,不写作法;
(2)如图(1),求证:
.
(3)拓展:如图(2),在
的延长线上取点
,使
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/ede495da-9534-47ee-ac8e-5e9df6a71ef0.png?resizew=318)
探究:如图(1),在直线
![](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/518586d91b63569fc317b323835a0c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
(1)用尺规在图(1)中构造一个与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
(2)如图(1),求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4418f84bd8fca1bcabb6d0ce3dc5b14d.png)
(3)拓展:如图(2),在
![](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/b29825c63e009627c654fea6ff59d543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810f4d55547f2ee5b39a2495493bff2a.png)
您最近一年使用:0次
9 . 问题探究:
(1)在图1和图2中,AB
CD,AD⊥BC于点O.
①如图1,若点O是BC的中点,AD=6,BC=8,则AD2=____,BC2=____,(AB+CD)2=_____;
②如图2,AO:DO=1:3,AO=3,BO=4,则AD2=_____,BC2=_____,(AB+CD)2=_____;
(2)请你观察(1)中的计算结果,猜想AD2,BC2,(AB+CD)2三者之间的关系.
归纳证明:
(3)请利用图2证明你发现的关系式;
应用结论:
(4)如图3,在矩形ABCD中,E,F两点均在AD边上,BE⊥CF交于G点,EF:BE=1:4,CF=3,BC=4.求证:CG=CD;
拓展应用:
(5)如图4,已知BD为△ABC的中线,CE⊥BD交AB于点E,交BD于点F,AE=5,BD=10,EC=15,求BC的长.
(1)在图1和图2中,AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
①如图1,若点O是BC的中点,AD=6,BC=8,则AD2=____,BC2=____,(AB+CD)2=_____;
②如图2,AO:DO=1:3,AO=3,BO=4,则AD2=_____,BC2=_____,(AB+CD)2=_____;
(2)请你观察(1)中的计算结果,猜想AD2,BC2,(AB+CD)2三者之间的关系.
归纳证明:
(3)请利用图2证明你发现的关系式;
应用结论:
(4)如图3,在矩形ABCD中,E,F两点均在AD边上,BE⊥CF交于G点,EF:BE=1:4,CF=3,BC=4.求证:CG=CD;
拓展应用:
(5)如图4,已知BD为△ABC的中线,CE⊥BD交AB于点E,交BD于点F,AE=5,BD=10,EC=15,求BC的长.
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970583312384000/2971688598986752/STEM/f713a091-730c-48ce-82b6-1d53ba3a2811.png?resizew=612)
您最近一年使用:0次
10 . 数学课上,老师在黑板上展示了如下一道探究题:
在
中,
,
,点D,E分别在边AC,AB上,且
,试探究线段AE和线段AD的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/68ba5c24-d6e7-4210-a642-9a83f5eccff2.png?resizew=574)
(1)初步尝试
如图①,若
,请探究AE和AD的数量关系,并说明理由.
(2)类比探究
如图②,若
,小组讨论后,有小组利用120°的角作垂线构造直角三角形,通过证明两次三角形全等,得到AE和AD的数量关系仍然成立,请你写出推理过程;
(3)延伸拓展
如图③,将第(2)中的“点E在边AB上”改为“点E在边BA的延长线上”,其它条件不变,请探究AE和AD的数量关系(用含m的式子表示),并说明理由.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02adb59f0d7889cb04237104445c5766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/68ba5c24-d6e7-4210-a642-9a83f5eccff2.png?resizew=574)
(1)初步尝试
如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
(2)类比探究
如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
(3)延伸拓展
如图③,将第(2)中的“点E在边AB上”改为“点E在边BA的延长线上”,其它条件不变,请探究AE和AD的数量关系(用含m的式子表示),并说明理由.
您最近一年使用:0次