将一副三角板如图放置,使点A在DE上,BC∥DE,其中∠E=30°,则∠AFC的度数是( )
![](https://img.xkw.com/dksih/QBM/2019/10/12/2310290520399872/2311749514346496/STEM/5c194d404b52441fa9afbab229bfdcee.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/2019/10/12/2310290520399872/2311749514346496/STEM/5c194d404b52441fa9afbab229bfdcee.png?resizew=193)
A.45° | B.50° | C.75° | D.70° |
更新时间:2019-10-16 22:46:37
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【推荐1】如图,将一副三角尺按如图所示方式摆放,EF//AD,∠CAB=∠EDF=90°,∠C=45°,∠EFD=30°,∠BFD的度数是( )
![](https://img.xkw.com/dksih/QBM/2021/6/17/2744783966150656/2798854730670080/STEM/2500e785-4151-4c6b-99b3-33746daa24f7.png)
![](https://img.xkw.com/dksih/QBM/2021/6/17/2744783966150656/2798854730670080/STEM/2500e785-4151-4c6b-99b3-33746daa24f7.png)
A.15° | B.20° | C.30° | D.45° |
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【推荐2】如图,已知
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,要使
,添加的条件可以是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/54cf17fc-e429-417d-9adf-104acee83208.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eb8f7ac061eb44abd9edc4346c07745.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/54cf17fc-e429-417d-9adf-104acee83208.png?resizew=150)
A.![]() | B.![]() | C.![]() | D.![]() |
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