已知:如图,AB=DC,AB∥DC,求证:AD=BC.
![](https://img.xkw.com/dksih/QBM/2020/10/13/2569989780013056/2570319276425217/STEM/b1710b065cad443ebee9e5120b316423.png?resizew=197)
更新时间:2020-10-13 21:10:51
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【知识点】 全等的性质和SAS综合(SAS)解读
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解答题-证明题
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【推荐1】
和
都是以点B为顶点的等腰直角三角形,
.
(1)![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/b9112eb0-450e-439b-82e7-9cda98023b96.png?resizew=466)
如图1,当边
恰好在
的
边上时,连接
,
,易证
,从而证明
;(无需证明)
(2)如图2,当
和
如图摆放,连接
、
、
,其中
与
相交于点F.那么
与
的位置关系是否发生变化,请说明理由;
(3)如图3,当
和
如图摆放,F为
的中点,连接
、
、
,并在
的延长线上取一点G,连结
,使
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ae31b70c84b0c8bf215843182a8c66.png)
(1)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/b9112eb0-450e-439b-82e7-9cda98023b96.png?resizew=466)
如图1,当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.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/10be9d320051b838eaa5435696e0670f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0523fff76560809e94cf7482eaf59ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ae88e5627d1c943016f06ad663d1c8.png)
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解答题-证明题
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【推荐2】下面是证明定理“等腰三角形两底角相等”的三种添加辅助线的方法,选择其中一种,完成证明.
试证明等腰三角形两底角相等. 已知: ![]() ![]() 求证: ![]() ![]() | ||
方法一: 证明:如图,取 ![]() ![]() ![]() | 方法二: 证明:如图,过A作 ![]() ![]() ![]() | 方法三: 证明:如图,作 ![]() ![]() ![]() |
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