如图,
,
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb1a216ee158ed86c298455c91d168c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093b40702557d7291c5dea9dccccea2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/22f24429-aaa7-4e26-961a-3ce8fb2a9da5.png?resizew=196)
更新时间:2023-12-09 20:05:22
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【推荐1】如图,直线AB,CD分别经过线段MN两端点,∠BMN=100°,∠MNC=70°,则AB,CD相交所成的锐角大小是_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/098953af-bf4c-4093-afc8-65b8de25e75d.png?resizew=111)
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【推荐2】如图,
ABC中,延长BC到D,若∠A=30°,∠ACD=80°,则∠B=____ .
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【推荐1】如图,梯形ABCD中,AD∥BC,点M是AD的中点,不添加辅助线,梯形满足__________ 条件时,有MB=MC(只填一个即可).
![](https://img.xkw.com/dksih/QBM/2014/9/26/1573750726336512/1573750732283904/STEM/ebc683aab5494877bb879e5709436a32.png?resizew=116)
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【推荐2】如图所示,
,以点
为圆心,以适当长为半径作弧分别交
,
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【推荐1】如图,△ABC中,点D、E分别为BC、CA上的两点,且BD=CE,连接AD、BE交于点F,则∠FAE+∠AEF的度数是_________ .
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【推荐2】如图,平行四边形ABCD中,AC、BD相交于点O,OE⊥BD交AD、BC于E、F,若△ABE的周长为10,则四边形ABCD的周长是 _____ .
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