如图所示,将△ABC沿DE、HG、EF分别翻折,三个顶点均落在点O处,且EA与EB重合于线段EO,若∠DOH=78°,则∠FOG的度数为( ).
![](https://img.xkw.com/dksih/QBM/2018/11/12/2073992040144896/2074643903037440/STEM/3b992fbf4883438f8c4f8166554da52e.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2018/11/12/2073992040144896/2074643903037440/STEM/3b992fbf4883438f8c4f8166554da52e.png?resizew=257)
A.78° | B.102° | C.112° | D.120° |
更新时间:2018-11-13 19:08:29
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【知识点】 三角形折叠中的角度问题解读
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【推荐1】如图,在△ABC中,AB=AC=2,∠BAC=30°,将△ABC沿AC翻折得到△ACD,延长AD交BC的延长线于点E,则△ABE的面积为( )
![](https://img.xkw.com/dksih/QBM/2019/12/23/2361147761090560/2361342145052672/STEM/313f770d3c6d487083ec563d25242655.png?resizew=160)
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A.![]() | B.![]() | C.3 | D.![]() |
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【推荐2】将一张长方形纸片
按如图所示操作(
是
上一点):
(1)将
沿
向内折叠,点
落在点
处.
(2)将
沿
向内继续折叠,点
落在点
处,折痕与边
交于点
,若
,则
的大小是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8fe4026f1a0745ab9aa9fe64f0e482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0cffcc583dd19bc5aa2343c5ced80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e75d14708e6aa1404477db9d7e3166f0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6c2bb698b3ff800e371383ba6d717.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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