December 8th, 2016, 09:16 AM  #1 
Newbie Joined: Dec 2016 From: Geneva Posts: 5 Thanks: 0  How do I name this angle ?
Hi, I keep having to name these sorts of angles, but I don't know how to. Could anyone help me, please ? A is a point on g, a line. B is another point that is not on g. How do I name each of the angles caused by the intersection of AB and g (see attachment) ? Thanks for your help ! 
December 8th, 2016, 09:56 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,640 Thanks: 1319 
place another point on line g, call it point $\color{red}C$ the marked angle is $\angle{BAC}$ or $\angle{CAB}$ 
December 8th, 2016, 10:01 AM  #3  
Newbie Joined: Dec 2016 From: Geneva Posts: 5 Thanks: 0  Quote:
I just don't understand their logic. But thanks, anyway.  
December 8th, 2016, 12:59 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 18,053 Thanks: 1395  Obtuse.PNG The diagram above shows another angle corresponding to another position for C. With either position, one could mark the appropriate reflex angle as well. 

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