如图,将一副直角三角板摆放,点C在EF上,AC经过点D,已知∠A=∠EDF=90°,AB=AC,∠E=30°,∠BCE=40°,则∠CDF=( )
![](https://img.xkw.com/dksih/QBM/2019/4/20/2186442010402816/2187358033215488/STEM/12167c70e07d4b20a5ba4c58be5e2fd5.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2019/4/20/2186442010402816/2187358033215488/STEM/12167c70e07d4b20a5ba4c58be5e2fd5.png?resizew=145)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
18-19八年级上·广东深圳·期末 查看更多[2]
更新时间:2019-04-26 20:09:30
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【知识点】 三角形的外角的定义及性质解读
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【推荐1】如图,在△ABC中,∠ABC与∠ACD的平分线交于点A1,得∠A1;∠A1BC与∠A1CD的平分线相交于点A2,得∠A2;……;∠A2010BC与∠A2010CD的平分线相交于点A2011,得∠A2011.如果∠A=80°,则∠A2016=( )°
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A.80 | B.802016 | C.40 | D.80×![]() |
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单选题
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适中
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【推荐2】如图,已知∠AOB=10°,且OC=CD=DE=EF=FG=GH,则∠BGH= ( )
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A.50° | B.60° | C.70° | D.80° |
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