To find side $ a $ use formula:
$$ r = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$After substituting $ r = \frac{ 37 }{ 40 } $ we have:
$$ \frac{ 37 }{ 40 } = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$ $$ \sqrt{ 3 } \cdot a = \frac{ 37 }{ 40 } \cdot 2 $$ $$ \sqrt{ 3 } \cdot a = \frac{ 37 }{ 20 } $$ $$ a = \dfrac{ \frac{ 37 }{ 20 } }{ \sqrt{ 3 } } $$ $$ a = \frac{ 37 \sqrt{ 3}}{ 60 } $$