已知:正方形
中,
,
绕点
顺时针旋转,它的两边分别交
,
(或它们的延长线)于点
,
.
(1)当
绕点
旋转到
时(如图
),证明
.
(2)当
绕点
旋转到
时(如图
),线段
,
和
之间有怎样的数量关系?写出猜想,并加以证明.
(3)当
绕点
旋转到如图
的位置时,线段
,
和
之间又有怎样的数量关系?写出猜想,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/8ac52469-94d6-45cf-85f6-c9d36a3aeb7c.png?resizew=402)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f3175a979c2f908d6c5665e14894b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8c24906872c98c181f198ee0ab6e48.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320ceb774d9df2d337221eb7fa55e9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
12-13九年级上·江苏扬州·期末 查看更多[13]
(已下线)2011-2012学年江苏省扬州市邗沟中学九年级第一学期期末考试数学卷北师大版九年级上第一章 B拓展区 综合拓展山东省日照市实验中学2019-2020学年九年级上学期开学考试数学试题江西省抚州市乐安县2019-2020学年九年级上学期期中数学试题贵州省六盘水市2021-2022学年九年级上学期第一次月考数学试题云南省德宏傣族景颇族自治州芒市民族中学2020-2021学年八年级下学期数学期中试卷山东省东营市河口区2021-2022学年八年级上学期期末数学试题山东省东营市广饶县李鹊镇初级中学2022-2023学年八年级上学期期末数学试题(已下线)专题07 全等三角形证明方法:半角模型【考点串讲+热点题型专训】-2022-2023学年七年级数学下学期期中期末考点大串讲(北师大版)广东省河源市紫金县紫金县中山中学2022-2023学年九年级下学期开学考试数学试题云南省曲靖一中卓立学校2022-2023学年八年级下学期期中数学试题(已下线)23.2(培优课)半角模型(题型精讲精练)1(原卷版)(已下线)23.2(培优课)半角模型(题型精讲精练)2(原卷版)
更新时间:2023-07-18 23:43:36
|
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在
中,点
、
分别在边
、
上,
,
.
(1)说明:
;
(2)连接
,试判断直线
与线段
的关系,并说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93673798779ee69ab1d3d35ecf58731b.png)
(1)说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361931886379008/2362071459962880/STEM/9008847cc2b34a64aec9c4489a1f2f89.png?resizew=174)
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解答题-证明题
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适中
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【推荐2】如图,已知△ABC中,∠BAC=90°,AB=AC.D为线段AC上任一点,连接BD,过C点作
且AD=CE,试说明BD和AE之间的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/e143d0b2-8af9-43e9-a6eb-982b5ee80074.png?resizew=177)
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解答题-计算题
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适中
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【推荐1】某建筑测量队为了测量一栋居民楼ED的高度,在大树AB与居民楼ED之间的地面上选了一点C,使B,C,D在一直线上,测得大树顶端A的视线AC与居民楼顶端E的视线EC的夹角为90°,若AB=CD=12米,BD=64米,请计算出该居民楼ED的高度.
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544435470581760/2546281614303232/STEM/5db4cab3-6fe4-4dbd-bc65-5f345fa58851.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在
中,
,
,
于
,点
是线段
上一点,点
是
延长线上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/d92bca08-454f-4c47-856d-43d841e9ee41.png?resizew=177)
(1)证明:
是等边三角形;
(2)请写出线段
、
、
之间的数量关系,并说明理由.
![](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/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/d92bca08-454f-4c47-856d-43d841e9ee41.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee780a7d0e8811fb04d955304543fce.png)
(2)请写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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解答题-问答题
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适中
(0.65)
【推荐1】综合与探究:
如图1,在正方形
中,点E,F分别在边
上,且
,延长
到点G,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2981878383509504/2986343079067648/STEM/adce60e9-75bf-4899-bc0d-f4a6c122e1f7.png?resizew=309)
(1)【特例感知】
图1中
与
的数量关系是___________.
(2)【结论探索】
如图2,将图1中的
绕着点A逆时针旋转
,连接
并延长到点G,使得
,连接
,此时
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还存在(1)中的数量关系吗?判断并说明理由.
如图1,在正方形
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(1)【特例感知】
图1中
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)【结论探索】
如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb1aa7bc4a01962fc1297f17fa9128f.png)
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解答题-证明题
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【推荐2】如图,在正方形ABCD中,E为AB边上一点(不与点A,B重合),CF⊥DE于点G,交AD于点F,连接BG.
(1)求证:AE=DF;
(2)是否存在点E的位置,使得△BCG为等腰三角形?若存在,写出一个满足条件的点E的位置并证明;若不存在,说明理由.
(1)求证:AE=DF;
(2)是否存在点E的位置,使得△BCG为等腰三角形?若存在,写出一个满足条件的点E的位置并证明;若不存在,说明理由.
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解答题-证明题
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名校
【推荐1】如图,已知
中,
,
,将
绕
点逆时针旋转
得到
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/42820cf2-9014-4838-ab63-5add05e6c166.png?resizew=157)
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460cf7177277714facb9949596142dcf.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/42820cf2-9014-4838-ab63-5add05e6c166.png?resizew=157)
(1)求证:
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(2)求
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解答题-证明题
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适中
(0.65)
【推荐2】如图1,将两个完全相同的三角形纸片
重合放置,其中
.若固定
,将
绕点
旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/dd356b5e-5dcc-4857-b8a2-2efa0d52d082.png?resizew=495)
(1)如图2,当
绕点
旋转到点
恰好落在
边上时,
①若
,则旋转角的大小为__________;
②若
,则旋转角的大小为__________(用含
的式子表示);
(2)当
绕点
旋转到如图3所示的位置时,求证:
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/dd356b5e-5dcc-4857-b8a2-2efa0d52d082.png?resizew=495)
(1)如图2,当
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①若
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②若
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(2)当
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