In an acute angled ∆PQR,angle PQR =45 .Prove that:(PR)²=(PQ)² +(QR)²-4ar(∆PQR)

In an acute angled ∆PQR,angle PQR =45 .Prove that:(PR)²=(PQ)² +(QR

1.	In an acute angled ∆PQR,angle PQR =45 .Prove that:(PR)²=(PQ)² +(QR)²-4ar(∆PQR)
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