in an equilateral triangle ABC, D is a point on side BC such that BD = 1/3 BC prove - Maths - Triangles

Question

in an equilateral triangle ABC, D is a point on side BC such
that BD = 1/3 BC prove that 9 AD2 = 7 AB2

shanul.singh · Accepted Answer

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in an equilateral triangle ABC, D is a point on side BC such that BD = 1/3 BC. prove that 9 AD2 = 7 AB2