[tex] l = \frac{2 \times h \times \sqrt{3} }{3} = \frac{2 \times (3 \sqrt{3}) \sqrt{3} }{3} = \frac{2 \times 3 \sqrt{3} \sqrt{3} }{3} = \frac{2 \times 3 \times 3}{3} = 2 \times 3 = 6 \: cm [/tex]
