prove that sum of squares of diagonals of parallelogram is equal to the sum of squares of its sides
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what is apollonius theorem?
In geometry, Apollonius's theorem is a theorem relating the length of a median of a triangle to the lengths of its side. It states that "the sum of the squares of any two sides of any triangle equals twice the square on half the third side, together with twice the square on the median bisecting the third side".
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