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Rombul ABCD are AB=BD=6 cm. Aflati lungimea diagonalei AC
Umpic de ajutor,va rog?


Răspuns :

ABCD-romb
AB=BC=DC=AD
BD intersectat AC={O}
ΔABD
AB=BD=6
AB=AD              =>ΔABD-echilateral
fie [AO_|_ BD
AO-h
AO=l√3/2=  6√3/2=  3√3
AO=OC=AC/2  =>AC=2*AO=2*3√3=6√3