[tex]Aria~triunghiului~echilateral~este~data~de~formula:\\
\frac{ \sqrt{3} }{4} l^2unde~l=lungimea~latura~triunghiului.\\\\
Vine~asa: \frac{ \sqrt{3} }{4} * \sqrt[2]{3} ^2\\\\
=\ \textgreater \ Aria= \frac{ \sqrt{3} }{4} * \frac{12}{4} \\\\
=\ \textgreater \ Aria= \frac{1,73}{4} * \frac{12}{4} \\\\
=\ \textgreater \ Aria= \frac{5,19}{4} \\\\
=\ \textgreater \ Aria=1,29cm^2\\\\
(nu~stiu~sigur~daca~este~bine~dar~sper~ca~te-am~ajutat,cat~de~cat...)[/tex]
