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aflati aria unui triungi echilateral cu latura de 6cm

Răspuns :

A = l²√3/4 = 36√3/4 = 9√3 cm²
[tex]A_{\triangle}=l^{2}\dfrac{\sqrt{3}}{4}=6^{2}\dfrac{\sqrt{3}}{4}=36\dfrac{\sqrt{3}}{4}=9\sqrt{3}[/tex]
[tex]A_{\triangle}=9\sqrt{3}[/tex]