Aiuto n 76 77 79

Question

[attach]105074[/attach]

remanzini_rinaldo · Accepted Answer

[attach]105122[/attach] [attach]105123[/attach] https://www.youtube.com/watch?v=5dZZJiRa6lk

remanzini_rinaldo · Answer

[attach]105124[/attach] F. Viete theorem (aka cosine theorem) will prove that :  DL = √QR^2+RL^2-2*QR*RL*cos QR^L  DL = √QP^2+PL^2-2*QP*PL*cos QP^L  since QR = PL and RL = PQ , then cos QR^L = cos QP^L and, as a consequece, QR^L = QP^L

Aiuto n 76 77 79

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