[tex]P = 6*\frac{a^{2} \sqrt{3}}4\\P = 6*\frac{5^{2}\sqrt{3}}{4} = 6 * \frac{25\sqrt{3}}4 = 6 * 6,25\sqrt{3} = 37,5\sqrt{3} cm^{2} \\Obw = 5 * 6 = 30cm \\\\[/tex]
