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In a quadrilateral A B C D , prove that ...

In a quadrilateral `A B C D ,` prove that `A B^2+B C^2+C D^2+D A^2=A C^2+B D^2+4P Q^2,` where `P` and `Q` are middle points of diagonals `A C` and `B Ddot`

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RD SHARMA ENGLISH-SCALAR OR DOT PRODUCT-All Questions
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