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DeltaPQR is right angled at Q. If x & y ...

`DeltaPQR` is right angled at Q. If x & y are the mid-points of sides PQ & QR respectively. Then which one is not true of the following:

A

`RX^(2)+PY^(2)=5XY^(2)`

B

`RX^(2)+PY^(2)=XY^(2)+PR^(2)`

C

`4(RX^(2)+PY^(2))=5PR^(2)`

D

`RX^(2)+PY^(2)=3[PQ^(2)+QR^(2)]`

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