如图,直线l1∥l2,∠1=40°,∠2=75°,则∠3= ( )A.55° B.60°C.65° D.70°
题型:不详难度:来源:
如图,直线l1∥l2,∠1=40°,∠2=75°,则∠3= ( )
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102107-64897.jpg) |
答案
C |
解析
∵l1∥l2,∴∠BCA=∠1=40°, ∵∠ABC是∠2的对顶角,∴∠ABC=∠2=75°, 在△ABC中,∠3+∠BCA+∠ABC=180°. ∴∠3=180°-(∠BCA+∠ABC)=180°-(40°+75°)=65°.故应选C. |
举一反三
如图,直线a、b相交于点O,若∠1等于40°,则∠2=( )
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102058-77766.jpg) |
下图能说明∠1>∠2的是 ( )
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102056-61089.jpg) |
如图,与∠1是内错角的是( )
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102050-56319.jpg) |
如图,BC∥DE,∠1=108°,∠AED=75°,则∠A的大小是( )
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021102046-64343.jpg) |
最新试题
热门考点