To find side $ a $ use formula:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot a^2 }{ 2 }$$After substituting $ A = 3400 $ we have:
$$ 3400 = \dfrac{ 3 \sqrt{ 3 } \cdot a^2 }{ 2 }$$ $$ 3400 \cdot 2 = 3 \sqrt{ 3 } \cdot a^2 $$ $$ 6800 = 3 \sqrt{ 3 } \cdot a^2 $$ $$ a^2 = \dfrac{ 6800 }{ 3 \sqrt{ 3 } } $$ $$ a^2 = \frac{ 6800 \sqrt{ 3}}{ 9 } $$ $$ a = \sqrt{ \frac{ 6800 \sqrt{ 3}}{ 9 } } $$$$ a \approx 36.1754 $$