如图,四边形
是平行四边形,四边形
和
是正方形.试问:线段
,
有怎样的关系?并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c78b5b3732d43103e575dbb3e1b95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea61ea3f3cf0e3001a5094960e9dc11f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/c0ed7741-1960-47c4-b82d-1a8cd97f73cb.png?resizew=153)
更新时间:2023-05-15 10:01:56
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相似题推荐
解答题-计算题
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适中
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【推荐1】【问题情境】
已知
,
,点
,点
分别为
,
上的点,且
,试探究
和
之间的关系.
对于这个问题,小明是这样想的:
因为
是
的一个内角,可得
;因为
是平角
的一部分,可得
.对比这两个等式发现:
.那么
和
之间的关系与
和
的大小是否有关呢?
小明利用数学课上学习的“从特殊到一般”的思路,设计探究过程如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/b00c19f5-e98f-408d-a2ca-961b341bf8ba.png?resizew=176)
【从“特殊”入手】通过将
和
分别取特殊值,计算
和
的度数进而判断它们之间的关系.如下表:
请将上表填写完整,你发现了什么结论:__________.
【探究“一般”规律】通过取特殊值探究.小明发现
和
之间的关系与
和
的大小无关,于是设
,
,通过推理进一步验证
和
之间的关系.请写出推理过程.
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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
对于这个问题,小明是这样想的:
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4bd7a29438534f403690ed775cc79e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e044525113d70780e3a3869dc198da20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48385d2f631f647995e0626b56e95f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
小明利用数学课上学习的“从特殊到一般”的思路,设计探究过程如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/b00c19f5-e98f-408d-a2ca-961b341bf8ba.png?resizew=176)
【从“特殊”入手】通过将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![]() ![]() | ![]() ![]() | ![]() ![]() | |
![]() | |||
![]() |
【探究“一般”规律】通过取特殊值探究.小明发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6988b81937a2b98659c359d9ed686146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e5109e8ff34e1342e3ab398b84553f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/ca295b1c-f913-46fd-ae7f-f3c60e13be5c.png?resizew=182)
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解答题-作图题
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【推荐2】按下列要求画图并回答问题:
(1)在图1中将
的面积分成1:3的两部分,并描述你的作法______________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/351a2526-fde8-4082-95d0-cba30dd5e698.png?resizew=185)
(2)在图2中,完成以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/45a527ed-0ac5-469f-a529-9eba504e6579.png?resizew=184)
①作
的高
,
;
②比较
______
的大小(用“>”“<”“=”填空);
③请用无刻度的直尺(只能画直线)作出
边上的高
,描述
的作法_____.
(1)在图1中将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/351a2526-fde8-4082-95d0-cba30dd5e698.png?resizew=185)
(2)在图2中,完成以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/45a527ed-0ac5-469f-a529-9eba504e6579.png?resizew=184)
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
③请用无刻度的直尺(只能画直线)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-证明题
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【推荐1】如图所示,在四边形ABCD中,AB∥CD,AD//BC,点E,F在对角线AC上,且AE=CF,请你分别以E,F为一端点,和图中已标字母的某点连成两条相等的新线段(只需证明一组线段相等即可).
![](https://img.xkw.com/dksih/QBM/2019/12/18/2357815826653184/2358634736353280/STEM/942311925e77455994764cfba46a7df4.png?resizew=313)
(1)连接 ;
(2)结论: = ;
(3)证明:
![](https://img.xkw.com/dksih/QBM/2019/12/18/2357815826653184/2358634736353280/STEM/942311925e77455994764cfba46a7df4.png?resizew=313)
(1)连接 ;
(2)结论: = ;
(3)证明:
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【推荐2】如图,
中,
,D为
延长线上一点,点E在
边上,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/25cddef4-867e-46d6-a44b-68c0085c9b20.png?resizew=160)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cfecff00e833bea0b5a63d2b57e6d8.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/38ac49caae8e3b8869d19beeff98966e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d6b8eb0feda7220211797bf01ecf3e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/25cddef4-867e-46d6-a44b-68c0085c9b20.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074887bdd8da63f19f3e488ae2275d8b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd1b299708090afdb770c4a3759e4b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
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解答题-证明题
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【推荐1】如图,已知四边形
是平行四边形,
,垂足分别是E、F,并且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328e78c9dc9454df0314476d4b93e6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f718e34f5af556bd4a0994ad5a80ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7c606d28a02e8a2bf2ea83e1454577.png)
![](https://img.xkw.com/dksih/QBM/2023/5/24/3244694451707904/3259739677868032/STEM/79df73777106433b839e845b1f51708f.png?resizew=204)
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【推荐2】如图,平行四边形ABCD中,点E、F分别在边BC、AD上,EA⊥AC,FC⊥AC.
(1)求证:
;
(2)若
,
,求证:AB=AF.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b80221af419f1b614a406aec80cb4e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819da3836c66c6b2792f6bfe6fc1bc04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/28/5fe3b28c-246a-4e2a-9fd6-9a913625f413.png?resizew=323)
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【推荐1】如图,在正方形ABCD中,E为对角线AC上一点,CE=CD,连接EB、ED,延长BE交AD于点F.求证:DF2=EF•BF.
![](https://img.xkw.com/dksih/QBM/2018/11/20/2079699573071872/2082954063994880/STEM/f934b9df29e24dd5a6599ae244371dc6.png?resizew=130)
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解答题-问答题
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【推荐2】【问题解决】
(1)已知在
中,
,
,四边形
是正方形,H为
所在的直线与
的交点.如图1,当点F在
上时,请判断
和
的关系,并说明理由.
【问题探究】
(2)如图2,将正方形
绕点C旋转,当点D在直线
右侧时,诸写出
、
与
的数量关系 ;
【问题拓展】
(3)将正方形
绕点C旋转一周,当
时,若
,
,请直接写出线段
的长 .
(1)已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【问题探究】
(2)如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
【问题拓展】
(3)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22b02f6c8636152aeb62d191251e931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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