To find side $ a $ use formula:
$$ r = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$After substituting $ r = \frac{ 1 }{ 2 } $ we have:
$$ \frac{ 1 }{ 2 } = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$ $$ \sqrt{ 3 } \cdot a = \frac{ 1 }{ 2 } \cdot 2 $$ $$ \sqrt{ 3 } \cdot a = 1 $$ $$ a = \dfrac{ 1 }{ \sqrt{ 3 } } $$ $$ a = \frac{\sqrt{ 3 }}{ 3 } $$