1.

If P is a point inside a convex quadrilateral ABCD such that PA^2+PB^2+PC^2+PD^2 is twice the area of the quadrilateral , then the correct statements is/ are

Answer»

<P>PA, PB , PC all are EQUAL
ABCD MUST be a SQUARE and P must be its centre
ABCD must be a square but P may be its centre
ABCD may not be square

Answer :A,B


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