STEP 1: find side $ a $
To find side $ a $ use formula:
$$ d = 2 \cdot a $$After substituting $ d = 8 $ we have:
$$ 8 = 2 \cdot a $$ $$ a = \dfrac{ 8 }{ 2 } $$ $$ a = 4 $$STEP 2: find area $ A $
To find area $ A $ use formula:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot a^2 }{ 2 } $$After substituting $ a = 4 $ we have:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 4^2 }{ 2 } $$ $$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 16 }{ 2 }$$ $$ A = \dfrac{ 48 \sqrt{ 3 } }{ 2 }$$ $$ A = 24 \sqrt{ 3 } $$