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December 8th, 2016, 10:16 AM   #1
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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 !
Attached Files
 Angle question.pdf (4.4 KB, 3 views)

December 8th, 2016, 10:56 AM   #2
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place another point on line g, call it point $\color{red}C$

the marked angle is $\angle{BAC}$ or $\angle{CAB}$
Attached Images
 angleBAC.jpg (5.4 KB, 1 views)

December 8th, 2016, 11:01 AM   #3
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Quote:
 Originally Posted by skeeter place another point on line g, call it point $\color{red}C$ the marked angle is $\angle{BAC}$ or $\angle{CAB}$
But I once saw it done another way. See page 2 of http://imosuisse.ch/smo/skripte/geom...geometrie1.pdf
I just don't understand their logic. But thanks, anyway.

December 8th, 2016, 01:59 PM   #4
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Quote:
 Originally Posted by Matthewmatician . . . each of the angles
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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