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In squareABCD is a quadrilateral. M is t...

In `squareABCD` is a quadrilateral. M is the midpoint of diagonal AC and N is the midpoint of diagonal BD. Prove that : `AB^(2)+BC^(2)+CD^(2)+DA^(2)=AC^(2)=AC^(2)+BD^(2)+4MN^(2).`

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The correct Answer is:
`thereforeAB^(2)+BC^(2)+CD^(2)+DA^(2)=AC^(2)=AC^(2)+BD^(2)+4MN^(2).`
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