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4(m_a^2+m_b^2+m_c^2)=3(a^2+b^2+c^2)

Source: Kosovo IMO TST 2012 problem 3

April 22, 2012
geometryparallelogramgeometry proposed

Problem Statement

If a,b,ca,b,c are the sides of a triangle and ma,mb,mcm_a , m_b, m_c are the medians prove that 4(ma2+mb2+mc2)=3(a2+b2+c2)4(m_a^2+m_b^2+m_c^2)=3(a^2+b^2+c^2)