[tex]\it Fie\ h- \^{i}n\breve al\c{\it t}imea,\ \ \ \ell-\ latura \ triunghiului.[/tex]
[tex]\it h=\dfrac{\ell\sqrt3}{2} \Rightarrow 3=\dfrac{\ell\sqrt3}{2}\Rightarrow \sqrt3\cdot\sqrt3 =\dfrac{\ell\sqrt3}{2}|_{:\sqrt3}\Rightarrow \sqrt3=\dfrac{\ell}{2} \Rightarrow \ell=2\sqrt3[/tex]
[tex]\it \mathcal{A}=\dfrac{\ell^2\sqrt3}{4}=\dfrac{(2\sqrt3)^2\sqrt3}{4}=\dfrac{\not4\cdot3\sqrt3}{\not4}=3\sqrt3\ cm^2[/tex]
