Posted by Jacob on Monday, April 8, 2013 at 10:29pm.
ABC is a triangle with circumcenter O , obtuse angle BAC and AB<AC . M and N are the midpoints of BC and AO respectively. Let D be the intersection of MN with AC . If AD=1 2 (AB+AC) , what is the measure (in degrees) of ÚBAC ?

Geometry  stop, Sunday, April 14, 2013 at 6:53pm
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