1 . 如图,
和
相交于点
,
,
,求证:
.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0866e1551b61074ca8e61261ecd1f9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
您最近一年使用:0次
2 . 如图,
和
相交于点O,
,求证:
.
![](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/2bd884bafe9ae693434f481ddcdd615b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
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3 . 如图,在正方形
中,
为
边的中点,
为对角线
上的一点,连接
交
于点
.连接
,
,
.
.
(2)若
,求证:
.
(3)若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe3a78950f6a4bb479c7ec0d8e57b5b.png)
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3533510f636213f8c361aec8d485044.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf1f907ef291e95b19857ec6f12a8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e505e321949d355f7cfe37f820780a5a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454942cbc196a5c481def783ff9a9aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe3a78950f6a4bb479c7ec0d8e57b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99470d92e0919cfb2e0dc0b5a134f19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
您最近一年使用:0次
4 . 综合与实践
问题情境:
综合实践课上,老师让同学们以“三角形与四边形的相互转化”为主题展开数学活动.善思小组发现特殊三角形和特殊四边形之间可以相互转化解决问题,如矩形可以转化为两个直角三角形,菱形可以转化为两个等腰三角形等;而特殊三角形也可以转化为特殊四边形.他们通过探究提出“以等腰三角形为背景可以构造出平行四边形”,具体操作如下:如图1,在等腰三角形
中,
为
边上一点,过点B作
,且
,以点E为圆心,
长为半径画弧,交
的延长线于点F,连接
并延长,交
的延长线于点G,连接
.
(1)①图1中
与
的数量关系为___________;
②在不添加字母的条件下找出图1中的平行四边形,并说明理由.
(2)如图1,试猜想
与
的位置关系,并给出证明.
拓展应用:
(3)如图2,在等腰三角形
中,其他条件不变,若射线
恰好经过
的中点O,且
,
,请直接写出
的长.
问题情境:
综合实践课上,老师让同学们以“三角形与四边形的相互转化”为主题展开数学活动.善思小组发现特殊三角形和特殊四边形之间可以相互转化解决问题,如矩形可以转化为两个直角三角形,菱形可以转化为两个等腰三角形等;而特殊三角形也可以转化为特殊四边形.他们通过探究提出“以等腰三角形为背景可以构造出平行四边形”,具体操作如下:如图1,在等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2586d7ae15fc7878ab150b2fac31e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62dcef170114cd71b99f6646d364ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e13b42697687260bda1028221c9fbbe.png)
(1)①图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②在不添加字母的条件下找出图1中的平行四边形,并说明理由.
(2)如图1,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
拓展应用:
(3)如图2,在等腰三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0ae8b73d3da30c91848d9a473a7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2775c661875e302b80216a4fd257db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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5 . (1)问题发现
和
中,
,
,
,连接
、
,则
、
的数量关系是
,
,
所在直线相交所成夹角的度数为______.
(2)类比探究
如图
,在
和
中,
,
,连接
,
,请判断
,
的数量关系及
,
所在直线相交所成夹角的度数,并说明理由.
(3)拓展延伸
在(2)的条件下,将
绕点
在平面内旋转.若
,
,请直接写出当直线
经过点
时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df14ccffcd0241dcb7fb1ced02d32d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78c42618c038aa8bf15cb6151d3209b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6278e12b0d3ab7e184e0b4147888a1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71053b2dba1f1d12805269920eb68d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17b35ab404be024d1e186f9d8e37e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17187d94dd45233699f212031db7449a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(2)类比探究
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df14ccffcd0241dcb7fb1ced02d32d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78c42618c038aa8bf15cb6151d3209b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6278e12b0d3ab7e184e0b4147888a1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a39e192ea03cd4d2f7c31c76671c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(3)拓展延伸
在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78c42618c038aa8bf15cb6151d3209b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf90f5b639e3262a07f89bc4bb85566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6f5f791e5c43712058e47668bdce1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
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6 . 已知:如图,点D在
内部,连接
.若
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc1a80f3d9daaba119b22cdc0183967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5efc4c192696de36f02f40ddd3be2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f820ef108b2d7e98cf4b9c2e276a0.png)
您最近一年使用:0次
2024九年级下·全国·专题练习
7 . 如图,点C为线段
上一点,分别以
,
为等腰三角形的底边,在
的同侧作等腰
和等腰
,且
.在线段
上取一点F,使
,连接
,
.
;
(2)如图2,若
,
的延长线恰好经过
的中点G,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc12fd638cffc9d0f1daf001b405eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e4fee4236fb4f5c8bebc190bf68c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e319f1d61d3146c7e49164f338ac27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f620db75d870f6052c40689e8af93.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3746205daae4787d8e31d74ba79e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
您最近一年使用:0次
8 . 如图,在
和
中,
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aa48f9c149b362f3a9d9d1eb781763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f530b7ce530b159df8339f93dc505c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf863ae4d0a7dfaa5b7ec97355e2fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c35067cc5aef3d28d3e9ac78c9c832.png)
您最近一年使用:0次
名校
9 . 如图,点
、
在
上,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca870b77f51a4f83e1dae16621eb203b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226e9c751b7cc63add206f9b48020cc9.png)
您最近一年使用:0次
2024-06-08更新
|
397次组卷
|
8卷引用:2024年福建省南平市光泽县第一中学中考模拟数学试题
2024年福建省南平市光泽县第一中学中考模拟数学试题2024年云南省云南师范大学附属中学呈贡校区九年级数学月考题(五)2024年广东省广州市第二中学中考二模数学试题2024年云南省玉溪市通海县初中学业水平考试模拟数学试题江苏省宿迁市泗阳县2023-2024学年八年级上学期期末数学试题(已下线)专题04 三角形(考点清单)-2023-2024学年七年级数学下学期期中考点大串讲(北师大版)(已下线)专题04 三角形(考点清单)-2023-2024学年七年级数学下学期期末考点大串讲(北师大版)(已下线)北师大版七年级数学下学期期末模拟试卷01-2023-2024学年七年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(北师大版)
10 . 给出一个新定义:有两个等腰三角形,如果它们的顶角相等、顶角顶点互相重合且其中一个等腰三角形的一个底角顶点在另一个等腰三角形的底边上,那么这两个等腰三角形互为“友好三角形”.
和
互为“友好三角形”,点D是
边上一点(不与点B重合),
,
,
,连接
,则
________
(填“<”或“=”或“>”),
________°;
(2)如图②,
和
互为“友好三角形”,点D是
边上一点,
,
,
,M、N分别是底边
的中点,请探究
与
的数量关系,并说明理由;
(3)如图③,
和
互为“友好三角形”,点D是
边上一动点,
,
,
,M、N分别是底边
的中点,请直接写出
与
的数量关系(用含
的式子表示)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a888af84a973afcc566759428cf8ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/b753dbb5a670dd4f5e23bb919e44dda2.png)
(2)如图②,
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/d959ad0bf10a92c6c6be067f7094fcb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59d794eb6d6623e407941a8db6beeb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图③,
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/28b2c767972aa7c8ca26d50d33bc001b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59d794eb6d6623e407941a8db6beeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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