如图,正方形ABCD中,AB=6,点E在边CD上,且CD=3DE,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连结AG、CF,下列结论:
①△ABG≌△AFG;② BG=GC;③ AG∥CF;④∠GAE=45°.
则正确结论的个数有( )
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168998896140288/2171179288666112/STEM/48003fe128544ac2a389088ae768990c.png?resizew=138)
①△ABG≌△AFG;② BG=GC;③ AG∥CF;④∠GAE=45°.
则正确结论的个数有( )
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168998896140288/2171179288666112/STEM/48003fe128544ac2a389088ae768990c.png?resizew=138)
A.1 | B.2 | C.3 | D.4 |
更新时间:2019-03-29 22:58:28
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【推荐1】老师在黑板上出了这样的练习题:
如图1所示,四边形
是
内接四边形,连接AC、BD.BC是⊙O的直径,
.请说明线段AD、BD、CD之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/bc3128e9-d246-4005-be21-b70781e2f01f.png?resizew=133)
下面是王林解答该问题的思路片段,下列选项错误 的是( )
如图2,过点A作
交BD于点M ∵★,∴
,……
∴
(@),∴
,
,
∴是等腰直角三角形,……可得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/fb000913-c054-4ba9-9d5a-d7787311b988.png?resizew=129)
如图1所示,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/bc3128e9-d246-4005-be21-b70781e2f01f.png?resizew=133)
下面是王林解答该问题的思路片段,下列选项
如图2,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e54031edc760ce2bd2347665b75c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60777fcf95eded5256edfb218250ed4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d48c9483f265f1327030bafea28c33f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c780c8f43ce63266571994c756e6b0bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05aaeccb3b7fce3c4c6103be6e3394be.png)
∴是等腰直角三角形,……可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a833aee5da762906d416918fd935010.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/fb000913-c054-4ba9-9d5a-d7787311b988.png?resizew=129)
A.★表示![]() ![]() ![]() |
B.直接依据@表示AAS |
C.是![]() |
D.图中辅助线做法也可以是在BD上取![]() |
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【推荐2】已知如图,在
中,
,
,直角
的顶点
是边
的中点,两边
,
分别交
,
于点
,
,当
在
内绕顶点
旋转(点
不与
,
重合)时,给出以下5个结论:①
;②
是等腰直角三角形;③
;④
;⑤
.上述结论始终正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/71f7cf5e-1d07-4be1-8a81-cc758579e8e2.png?resizew=174)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769d46f16f6c57f869a54238e7214ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c1c061ff319df767429f5a1e1e5d02.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】如图,边长为
的正方形
内接于
,
,
分别与
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和点
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的延长线与
的延长线交于点
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,正方形ABCD与矩形EFGH在直线
的同侧,边AD,EH在直线
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