QT AND RS are the medians of a triangle PQR right angled at p. Prove that (QT^2+RS^2)=5QR^2.
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TQ²+RS²= (TP²+PQ²)+(RP²+PS²)
=(PR²/4)+PQ²+RP²+(PQ²/4)
=[PR²+4PR²]/4+[4PQ²+PQ²]/5
=5(PR²+PQ²)/4
=5QR²/4
4(TQ²+RS²)=5QR²
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