名校
1 . (问题提出)如图1,在等边
内部有一点P,
,
,
,求
的度数.
(数学思考)当图形中有一组邻边相等时,通过旋转可以将分散的条件集中起来解决问题.
【尝试解决】将
绕点A逆时针旋转
,得到
,连接
,则
为等边三角形.
,又
,
,
,
为 三角形,
的度数为 .
【类比探究】如图2,在
中,
,
,其内部有一点P,若
,
,
,求
的度数.
【联想拓展】如图3,在
中,
,
,其内部有一点P,若
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(数学思考)当图形中有一组邻边相等时,通过旋转可以将分散的条件集中起来解决问题.
【尝试解决】将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77565c0aab1ab567e92dc1aee447e271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2f90f1f950f19b10ee0b1852cec730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c1b818876f67168250424147bb0d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a5b655ed3cf2d4ebc3b34020a2e1720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130864c14a06933f5f43b9518fc49bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53b4ca701f6068e62e75eb6973d89bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37cd0cbc3bd5a07105ebb4a457bb3a2.png)
【类比探究】如图2,在
![](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/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
【联想拓展】如图3,在
![](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/474f34c6dc5621acad72270d2a49255d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8825d400f453c5c17a7beeb1cc9a9cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218870b4b09ddcb96183d6f9c672fb70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
您最近一年使用:0次
2023-09-27更新
|
401次组卷
|
4卷引用:2023年山东省济南市市中区实验初级中学中考考前四模(6月)数学试题
2023年山东省济南市市中区实验初级中学中考考前四模(6月)数学试题2023年山东省济南实验初级中学中考数学四模模拟预测题2024年山东省菏泽市郓城县中考五模考试数学试题(已下线)重难点02相似三角形四种模型(模型解读+典例剖析+培优争分练)-2024年中考数学【热点·重点·难点】专练(安徽专用)
2 . (1)【问题呈现】如图1,在
中,
,在
上取点D,过点D作
的垂线
交
于点E.若
,求
的值;
(2)【类比探究】在(1)的条件下,
绕点A逆时针旋转一定角度(点E在
的内部),如图2,连接
,求
的值;
(3)【拓展提升】在(2)的条件下,延长
交
于点F,交
于点G,如图3,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5375a13554748f2bb665298c9b325411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79586df2029edb34c7cb2f67dc3722.png)
(2)【类比探究】在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
(3)【拓展提升】在(2)的条件下,延长
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008a13558fdf96dc45178a6e49a94399.png)
![](https://img.xkw.com/dksih/QBM/2023/6/10/3256456209620992/3262923937685504/STEM/a6197432ec7547e09f0ee1c3e1cf8995.png?resizew=479)
您最近一年使用:0次
2023-06-19更新
|
110次组卷
|
4卷引用:山东省菏泽市定陶区2023-2024学年九年级上学期期末考试数学试题
3 . 如图1,在等腰直角三角形
中,以
为边在
右侧作正方形
.
与线段
的数量关系为 (直接写出答案);
(2)深入探究:如图2,将正方形
绕点D在平面内旋转,连接
.判断线段
与线段
的数量关系并说明理由;
(3)拓展延伸:若
,正方形
绕点D在平面内旋转的过程中,当点A,E,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)深入探究:如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193a42f63312ac6a40d6e28ee93325aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2023-09-17更新
|
56次组卷
|
2卷引用:山东省烟台市海阳市2022-2023学年九年级下学期期中数学试题
名校
4 . 【问题情境】
和
是共顶点的两个三角形,点P是边
上一个动点(不与B重合),且
,
,连接
.
(1)【特例分析】如图①,当
,
时.猜想
与
之间的数量关系,并说明理由;并求出
的度数.
(2)【拓展探究】如图②,当
,
时.请判断
与
的数量关系以及
与
之间的数量关系,并说明理由.
(3)【学以致用】如图③,当
,
,
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768e16640897560f85eb38ed7cb6512f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4a64f48ce64bcd490992a4ada1ef9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/3ed65cdc-d578-40bf-a953-478106dcdb26.png?resizew=395)
(1)【特例分析】如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8625b92cffeee72845e2823899fc2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241e82458d3829175373c3c018f15be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)【拓展探究】如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8625b92cffeee72845e2823899fc2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15928c11adfe993baa96ee76cb929f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)【学以致用】如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0505b2b098dc34a0d3c6be71b3e36f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574dc284fb9e74d65cf0c79a978d65de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
2023-05-19更新
|
156次组卷
|
4卷引用:山东省日照市东港区新营中学2023-2024学年九年级上学期12月月考数学试题
山东省日照市东港区新营中学2023-2024学年九年级上学期12月月考数学试题2023年湖北省襄阳市枣阳市中考一模数学试题(已下线)2023年襄阳一模(几何综合)(已下线)2023年湖北省黄冈市中考数学真题变式题21-24题
5 . 问题情境:在特殊四边形的复习课上,王老师出了这样一道题:
![](https://img.xkw.com/dksih/QBM/2022/3/11/2933925689540608/2938870854221824/STEM/7174ba266dd3410e8cf0f80fb063e3a6.png?resizew=388)
如图1,在菱形ABCD中,E、F、G、H分别为AB,BC,CD,DA边上的动点,连接EG,HF相交于点O,且∠HOE=∠ADC.
试探究:
(1)∠AEG与∠BFH的大小关系;
(2)EG与FH的大小关系;并说明理由.
(3)拓展延伸:若将题目中的菱形ABCD改为平行四边形ABCD(如图2),AB=a,AD=b,其他条件不变,则问EG:FH的值是多少?请直接写出结果.
![](https://img.xkw.com/dksih/QBM/2022/3/11/2933925689540608/2938870854221824/STEM/7174ba266dd3410e8cf0f80fb063e3a6.png?resizew=388)
如图1,在菱形ABCD中,E、F、G、H分别为AB,BC,CD,DA边上的动点,连接EG,HF相交于点O,且∠HOE=∠ADC.
试探究:
(1)∠AEG与∠BFH的大小关系;
(2)EG与FH的大小关系;并说明理由.
(3)拓展延伸:若将题目中的菱形ABCD改为平行四边形ABCD(如图2),AB=a,AD=b,其他条件不变,则问EG:FH的值是多少?请直接写出结果.
您最近一年使用:0次
真题
名校
6 . 某校一数学兴趣小组在一次合作探究活动中,将两块大小不同的等腰直角三角形
和等腰直角三角形
,按如图1的方式摆放,
,随后保持
不动,将
绕点C按逆时针方向旋转
(
),连接
,
,延长
交
于点F,连接
.该数学兴趣小组进行如下探究,请你帮忙解答:
时,则
_____;
(2)【初步探究】如图3,当点E,F重合时,请直接写出
,
,
之间的数量关系:_________;
(3)【深入探究】如图4,当点E,F不重合时,(2)中的结论是否仍然成立?若成立,请给出推理过程;若不成立,请说明理由.
(4)【拓展延伸】如图5,在
与
中,
,若
,
(m为常数).保持
不动,将
绕点C按逆时针方向旋转
(
),连接
,
,延长
交
于点F,连接
,如图6.试探究
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78f1b109b3c6d2390f0afb8e2513d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14dbafa1565aa5fb728b1b6edc1f8a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(2)【初步探究】如图3,当点E,F重合时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【深入探究】如图4,当点E,F不重合时,(2)中的结论是否仍然成立?若成立,请给出推理过程;若不成立,请说明理由.
(4)【拓展延伸】如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bf6a1ddc40eca17f3d5ce18c00bacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fd7458509752c375bb49bc58278481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
2022-06-16更新
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2005次组卷
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20卷引用:黄金卷08(青岛专用)-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷
(已下线)黄金卷08(青岛专用)-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷2024年山东省济南市天桥区九年级下学期中考一模数学模拟试题2024年山东省菏泽市鲁西新区中考三模数学试题2022年四川省达州市中考数学真题(已下线)专题17 图形变换(平移、旋转、对称)-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)专题09 图形的平移、对称、旋转与相似-2022年中考数学真题分项汇编 (四川专用)(已下线)专题14 相似三角形与全等三角形-三年(2020-2022)中考数学真题分项汇编(四川专用)(已下线)2022年四川省广元市中考数学变式题22-26(已下线)2022年四川省乐山市中考数学真题变式汇编22-26(已下线)专题4.54 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)第30课 相似三角形(动态几何,坐标问题)-2022-2023学年九年级数学上册课后培优分级练(北师大版)四川省达州市开江县永兴中学2022-2023学年九年级上学期11月月考数学试题江西省抚州市金溪县第一中学2022-2023学年九年级上学期第三次月考数学试题(已下线)2022年四川省达州市中考数学真题变式题21-25题(已下线)专题27.49 《相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题6.52 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)第五节 图形的旋转与位似03综合测江西省 抚州市 临川区江西省抚州市第一中学2023-2024年九年级上学期第二次月考数学试题(已下线)专题23 几何综合-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)2023年甘肃省平凉市初中毕业与高中招生数学模拟预测试题
7 . 综合与实践
问题情境:综合与实践课上,老师让同学们以“矩形纸片的折叠”为主题开展数学活动.老师给同学准备了一些
纸,已知
纸的长宽之比为
.
操作探究:如图1,将
纸
沿过点A的直线折叠,使点D的对应点
落在边
上展开后折痕
交
于点E.
(1)
的度数;
(2)求证:
.
(3)拓展延伸:如图2,在图1的基础上,继续沿过点A的直线折叠,使点B的对应点
落在
上,展开后折痕交
于点F,连接
.请判断
的形状并说明理由.
问题情境:综合与实践课上,老师让同学们以“矩形纸片的折叠”为主题开展数学活动.老师给同学准备了一些
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d76e86c1dcc191aa8d51b3a528a454d.png)
操作探究:如图1,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/d94ce422-2c55-4bd7-89ef-a7cf4c53f4cf.png?resizew=339)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466abad3325095407ca1dff1f3313ed3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322099528bf897d82489bd67b24c0a53.png)
(3)拓展延伸:如图2,在图1的基础上,继续沿过点A的直线折叠,使点B的对应点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
您最近一年使用:0次
2023-05-27更新
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189次组卷
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2卷引用:2023年山东省临沂市沂水县中考二模数学试题
8 . 如图1,△OAB和△OMN都是等腰三角形,∠O=30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/5668c020-d723-416f-b9dc-98c57d1ffae0.png?resizew=584)
(1)观察发现
请直接写出:
的值是 ,
的值是 ;
(2)问题探究
如图2,△OAB固定不动,将△OMN绕着点O自由旋转,旋转角为α(0°<α<360°),连接BN和AM.
的值改变吗?请说明理由;
(3)问题拓展
△OAB固定不动,若OA=2,OM=3.当△OMN绕着点O在自由旋转过程中,点M、B、N在同一条直线上时,求出线段AM的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/1/5668c020-d723-416f-b9dc-98c57d1ffae0.png?resizew=584)
(1)观察发现
请直接写出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7e6acbd699e28d5ff43b7e17ac6efc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d42e47b9110ef86d38b4dce6f7194f.png)
(2)问题探究
如图2,△OAB固定不动,将△OMN绕着点O自由旋转,旋转角为α(0°<α<360°),连接BN和AM.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d42e47b9110ef86d38b4dce6f7194f.png)
(3)问题拓展
△OAB固定不动,若OA=2,OM=3.当△OMN绕着点O在自由旋转过程中,点M、B、N在同一条直线上时,求出线段AM的长度.
您最近一年使用:0次
9 . 【问题呈现】
(1)如图1,
和
都是等边三角形,连接
.求证:
.
(2)如图2,
和
都是等腰直角三角形,
,连接
.请直接写出
的值.
(3)如图3,
和
都是直角三角形,
,且
.连接
.
的值;
②延长
交
于点
,交
于点
.求
的值.
(1)如图1,
![](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/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.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/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.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/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1252c92be062e8cbd73f33d55277dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
②延长
![](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/a0ed1ec316bc54c37c4286c208f55667.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/1a9966e88496810391a2483d25351bd7.png)
您最近一年使用:0次
2023-08-14更新
|
176次组卷
|
2卷引用:山东省菏泽市单县2022-2023学年九年级下学期期中数学试题
名校
解题方法
10 . 如图1,已知
和
均为等腰直角三角形,点D、E分别在线段
上,
.
绕点A逆时针旋转,连接
,
的延长线交
于点F.当
的延长线恰好经过点E时,点E与点F重合,此时,
①
的值为 ;
②
的度数为 度;
(2)类比探究:如图3,继续旋转
,点F与点E不重合时,上述结论是否仍然成立,请说明理由.
(3)拓展延伸:若
,
,当
所在的直线垂直于
时,请直接写出线段
的长.
![](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/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1bff74f3356bff74a51c48524bd13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a03841966d8142fa4a4aed023e37931.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)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77282d5b97a60264cf15fb74b48e4b59.png)
(2)类比探究:如图3,继续旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e6292216592a5eba3293a85bbdb3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571508bc4c42f2a2b2b223f871a6b155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2023-04-15更新
|
529次组卷
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13卷引用:2021年山东省济南市天桥区九年级下学期中考一模数学试卷
2021年山东省济南市天桥区九年级下学期中考一模数学试卷山东省济南汇才学校2021~2022 学年九年级上学期 数学期中试题山东省济南市天桥区2021一2022学年九年级上学期期中数学试题2023年山东省济南市平阴区中考一模数学试题(已下线)2023年山东省济南市中考二模数学试题变式题21-26题(已下线)2023年济南一模(几何综合)山东省济南市历下区济南燕山学校2023-2024学年九年级上学期10月月考数学试题2024年山东省青岛市九年级数学一模复习模拟试题2023年山东省济南市长清区第三初级中学中考三模数学试题2023年山东省济南市中考数学一模压轴题汇编试题2021年河南省实验中学中考数学第四次模拟考试试题江苏省 盐城市 东台市第五联盟2023-2024学九年级下学期第一次月考数学试题2024年广东省茂名市茂南区祥和中学二模数学试题