1)
[tex]b = 3\\b = a\sqrt{3} \\3 = a\sqrt{3}\\a = \frac{3}{\sqrt{3} } = \frac{3\sqrt{3} }{3} = \sqrt{3}\\c = 2a\\c = 2\sqrt{3}[/tex]
2)
c = 6
6 = 2a
a = 3
b = a[tex]\sqrt{3}[/tex]
b = [tex]3\sqrt{3}[/tex]
3)
[tex]a = 4\sqrt{3}\\b = a\sqrt{3}\\b = 4\sqrt{3} * \sqrt{3} = 4*3=12\\c = 4\sqrt{3} *2=8\sqrt{3}[/tex]
4)
[tex]a = \sqrt{39}\\b = a\sqrt{3}\\b = \sqrt{39*3} =\sqrt{117} = \sqrt{9*13} = 3\sqrt{13}\\c = 2a = 2\sqrt{39}[/tex]