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Prove that the area of an equilateral tr...

Prove that the area of an equilateral triangle is equal to `(sqrt(3))/4a^2,` where `a` is the side of the triangle. GIVEN : An equilateral triangle `A B C` such that `A B=B C=C A=adot` TO PROVE : `a r( A B C)=(sqrt(3))/4a^2` CONSTRUCTION : Draw `A D_|_B Cdot`

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