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Prove that the sum of the squares of the...

Prove that the sum of the squares of the squares of tha diagonals of a parallelogram is equal to tha sum of the squares of its sides. `
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Knowledge Check

  • In which of the following quadrilateral sum of squares of all sides is equal to the sum of squares of diagonals?

    A
    Parallelogram
    B
    Rhombus
    C
    Square
    D
    (A), (B) and (c )

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