STEP 1:
The side of the hexagon is equal the radius of the circumcircle. $$ a = 4 $$
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:
$$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 4^2 }{ 2 } $$ $$ A = \dfrac{ 3 \sqrt{ 3 } \cdot 16 }{ 2 }$$ $$ A = \dfrac{ 48 \sqrt{ 3 } }{ 2 }$$ $$ A = 24 \sqrt{ 3 } $$