To find side $ a $ use formula:
$$ r = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$After substituting $ r = \frac{ 667 }{ 2000 } $ we have:
$$ \frac{ 667 }{ 2000 } = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$ $$ \sqrt{ 3 } \cdot a = \frac{ 667 }{ 2000 } \cdot 2 $$ $$ \sqrt{ 3 } \cdot a = \frac{ 667 }{ 1000 } $$ $$ a = \dfrac{ \frac{ 667 }{ 1000 } }{ \sqrt{ 3 } } $$ $$ a = \frac{ 667 \sqrt{ 3}}{ 3000 } $$