如图,四边形纸片 ABCD 中, C=80 , B=70 ,将纸片折叠,使C 、 D 落在 AB 边上的C 、 D处,折痕为 MN ,则MNB =_____ °.
![](https://img.xkw.com/dksih/QBM/2020/9/30/2560818376065024/2564685850910721/STEM/b28ee5ee41c7401c9a932ecea9b7b5c1.png?resizew=150)
更新时间:2020-10-07 20:11:30
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【推荐1】如图,四边形
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【推荐2】如图,将
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【推荐1】如图,D是AB边上的中点,将△ABC沿过D的直线折健,使点A落住BC上F处,若∠B =50
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【推荐2】如图,
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