[tex]R = \frac{a\sqrt{3}}{3}\\oraz\\R = 8 \ cm\\\\\frac{a\sqrt{3}}{3} = 8 \ \ /\cdot\frac{3}{\sqrt{3}}\\\\a = \frac{8\cdot3}{\sqrt{3}}\cdot\frac{\sqrt{3}}{\sqrt{3}} = \frac{8\cdot3\sqrt{3}}{3} = 8\sqrt{3} \ cm\\\\h = \frac{a\sqrt{3}}{2} = \frac{8\sqrt{3}\cdot\sqrt{3}}{2} = 4\cdot3 = 12 \ cm\\\\P = \frac{a^{2}\sqrt{3}}{4} = \frac{(8\sqrt{3})^{2}\cdot\sqrt{3}}{4} = \frac{64\cdot3\sqrt{3}}{4} = 16\cdot3\sqrt{3} = 48\sqrt{3} \ cm^{2}[/tex]
