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Aria unui triunghi echilateral cu inaltimea de 6 cm este de ..cm patrati


Răspuns :

[tex]h=\dfrac{l\sqrt3}{2}=6\Rightarrow l=\dfrac{12}{\sqrt3}=4\sqrt3 \ cm[/tex]

[tex]A=\dfrac{l^2\sqrt3}{4}=\dfrac{48\sqrt3}{4}=12\sqrt3\ cm^2.[/tex]