[tex]d = 5 \sqrt{3} [/tex]
[tex]d = l \sqrt{3} [/tex]
[tex]a)l \sqrt{3} = 5 \sqrt{3} \: | \div \sqrt{3} [/tex]
[tex]l = 5[/tex]
[tex]b)A_{t} = 6 {l}^{2} [/tex]
[tex]A_{t} = 6 \times {5}^{2} [/tex]
[tex]A_{t} = 6 \times 25[/tex]
[tex]A_{t} = 150[/tex]
