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PROVE :2<B less than (<A+<C)

Albert

Well-known member
Jan 25, 2013
1,225
$\triangle ABC (with \,\, side \,\, length \,\, a,b,c)$
$if :2b<a+c$
$prove :2\angle B <\angle A +\angle C$
 

Albert

Well-known member
Jan 25, 2013
1,225
solution :
2b less than a+c.JPG