a)
[tex]ap = \frac{1}{3} \times \frac{l \times \sqrt{3} }{2} [/tex]
adica 5radical din 3 totul supra 6 cm
b)
[tex] \frac{1}{3} \times \frac{l \times \sqrt{3} }{2} = 2 \times \sqrt{3} [/tex]
[tex] \frac{l \times \sqrt{3} }{6} = 2 \times \sqrt{3} [/tex]
l × radical din 3 = 12 × radical din 3
l = 12
