STEP 1: find side $ a $
To find side $ a $ use formula:
$$ s = \sqrt{ 3 } \cdot a $$After substituting $ s = \frac{ 3 }{ 8 } $ we have:
$$ \frac{ 3 }{ 8 } = \sqrt{ 3 } \cdot a $$ $$ a = \dfrac{ \frac{ 3 }{ 8 } }{ \sqrt{ 3 } } $$ $$ a = \frac{\sqrt{ 3 }}{ 8 } $$STEP 2: find diagonal $ d $
To find diagonal $ d $ use formula:
$$ d = 2 \cdot a $$After substituting $ a = \frac{\sqrt{ 3 }}{ 8 } $ we have:
$$ d = 2 \cdot \frac{\sqrt{ 3 }}{ 8 } $$ $$ d = \frac{\sqrt{ 3 }}{ 4 } $$