MI A on side BC of a AABC intersects BC ...

MI A on side BC of a AABC intersects BC at D such that DB=3 CD see Fig. 6.55). Prove that 2 AB2=2AC2+ BC2. A 6.55 15. In anrequilateral triangle ABC wMD=VAB? Fig. 6.53 oint on side BC such that BD= BC. Prove that Iban equilateral triangle

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

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