To find side $ a $ use formula:
$$ r = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$After substituting $ r = 510 $ we have:
$$ 510 = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$ $$ \sqrt{ 3 } \cdot a = 510 \cdot 2 $$ $$ \sqrt{ 3 } \cdot a = 1020 $$ $$ a = \dfrac{ 1020 }{ \sqrt{ 3 } } $$ $$ a = 340 \sqrt{ 3 } $$