To find side $ a $ use formula:
$$ r = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$After substituting $ r = \frac{ 3 }{ 8 } $ we have:
$$ \frac{ 3 }{ 8 } = \dfrac{ \sqrt{ 3 } \cdot a }{ 2 } $$ $$ \sqrt{ 3 } \cdot a = \frac{ 3 }{ 8 } \cdot 2 $$ $$ \sqrt{ 3 } \cdot a = \frac{ 3 }{ 4 } $$ $$ a = \dfrac{ \frac{ 3 }{ 4 } }{ \sqrt{ 3 } } $$ $$ a = \frac{\sqrt{ 3 }}{ 4 } $$