Question: How to solve this proof - vetor 3. prove the sum of the squares of the lengths of a parallelograms diagonals is equal to the

How to solve this proof - vetor

How to solve this proof - vetor 3. prove the sum of

3. prove the sum of the squares of the lengths of a parallelograms diagonals is equal to the sum of the squares of lengths of the sides. A D C

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