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[" perpendicular from Connomont on side BC such that "BD=(1)/(3)BC" .Prove that "(AD=7hg)/(3)" ress in "],[" In an equilateral triangle "ABC" ,D is a point on side "BC" such that "BD=(1)/(3)BC" .Prove that "$AD=7" nes in "],[qquad 1,ABCD" Prove that "OB^(2)+OD^(2)=OA^(2)+OC^(2)" .(R.P) "]

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