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AB=BC=4
m(ABC)= 60 grade

aflati aria tri. ABC


Răspuns :

[tex]S_{ABC}=\frac{AB*BC*\sin B}{2}=\frac{4*4*\frac{\sqrt3}{2}}{2}=4\sqrt3[/tex]
aria = [ AB · BC ·sin60 ] : 2 = [ 4·4·√3/2  ] : 2 = 8√3 :2 = 4√3