Online Geometry Problems

Online Geometry Problem 304. Triangle, Angle bisector, 120 Degrees. Level: High School, College, Mathematics Education

In a triangle ABC, the angle BAC is equal to 120 degrees. If AB = c, AC = b, and AD = x. Prove that Formula to prove.
(x is one-half the harmonic mean of b and c) 

Triangle, 120 degrees, Angle bisector


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