Va rog?! Ex 2.... Va rog

AD intersecteaza BC in O;
triunghiAOB:
tgA=OB/AO=>rad(3)/3=OB/8rad(2)=>OB=8rad(6)/3=>BD=16rad(6)/3
AB^2=AO^2+BO^2
AB^2=128+512
AB^2=640
AB=8rad(10)=>P romb=4*8rad(10)=>Promb=32rad(10)