In an equilateral triangle ABC, D is a point on side BC such that BD=1/3 BC. Prove that 9AD^2=7AB^2

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answered Feb 4, 2018 by Vikash Kumar (144,729 points)

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In an equilateral triangle ABC, D is a point on side BC such that BD=1/3 BC. Prove that 9AD^2=7AB^2

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