Răspuns :
Arie triunghi echilateral = [tex] \frac{l^2 \sqrt{3} }{4} = \frac{36 \sqrt{3} }{4} =9 \sqrt{3} [/tex]
[tex]A = \frac{ l^{2} \sqrt{3}}{4} = \frac{ 6^{2} \sqrt{3} }{4} = \frac{36 \sqrt{3} }{4} =9 \sqrt{3} ~ cm^{2} [/tex]