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

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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 AD^2 = 7 AB^2. for sample paper 2020 class 10 math

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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 AD^2 = 7 AB^2.
class 10 math
sample paper 2020 class 10
class 10 math important questions