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

Prove that the sum of the squares of the diagonals of parallelogram is equal to the sum of the squares of its sides.

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Let, ABCD is a parallelograma
`AB = CD`, `AD = BC` [Since opposite sides of a parallelogram are equal]
AC and BD are the diagonals of the parallelogram ABCD
Draw `AE ⊥ CD`, `DF ⊥ AB`
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