To find side $ a $ use formula:
$$ B = \dfrac{ \sqrt{ 3 } \cdot a^2 }{ 4 }$$After substituting $ B = 8 $ we have:
$$ 8 = \dfrac{ \sqrt{ 3 } \cdot a^2 }{ 4 }$$ $$ 8 \cdot 4 = \sqrt{ 3 } \cdot a^2 $$ $$ 32 = \sqrt{ 3 } \cdot a^2 $$ $$ a^2 = \dfrac{ 32 }{ \sqrt{ 3 } } $$ $$ a^2 = \frac{ 32 \sqrt{ 3}}{ 3 } $$ $$ a = \sqrt{ \frac{ 32 \sqrt{ 3}}{ 3 } } $$$$ a \approx 4.2983 $$