如图,直线AB、CD相交于点O,OE⊥AB,且∠DOE=30°,则∠AOC=______.
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如图,直线AB、CD相交于点O,OE⊥AB,且∠DOE=30°,则∠AOC=______.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090046-82635.png) |
答案
∵OE⊥AB, ∴∠AOE=90°. ∴∠AOC=180°-∠AOE-∠DOE=180°-90°-30°=60°. |
举一反三
如图:A、O、B在同一直线上,AB⊥OE,OC⊥OD,则图中互余的角共有______对.![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090043-59703.png) |
如图,直线AB与CD相交于点O,OP是∠AOD的平分线,OF⊥CD,如果∠BOD=30°. 求:(1)∠AOF的度数; (2)∠POF的度数.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090036-91434.png) |
如图,BC⊥AC,CB=4cm,AC=3cm,AB=5cm,则点C到AB的距离______cm.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090034-38668.png) |
如图,三条直线相交于点O.若CO⊥AB,∠1=56°,则∠2等于( )
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090029-77349.png) |
如图,直线AB,CD相交于O,OE平分∠AOD,FO⊥OD于O,∠1=40°,则∠2=______度,∠4=______度.
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024090025-97834.png) |
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