Объяснение:

[tex]r = \frac{6 \sqrt{3} }{2 \sqrt{3} } = \frac{6}{2} = 3 \\ R = \frac{a}{ \sqrt{3} } = \frac{6}{ \sqrt{3} } = 6 \times \frac{ \sqrt{3} }{3} = 2 \sqrt{3 } \\ s = \sqrt{ \frac{3}{4} } \times (6 \sqrt{3})^{2} = 54 \sqrt{3} [/tex]