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PQR is a triangle right-angled at Q. If ...

PQR is a triangle right-angled at Q. If X and Y are the mid-points of the sides PQ and QR respectively, then which one of the following is not correct?

A

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

B

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

C

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

D

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

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