STEP 1: find side $ a $
To find side $ a $ use formula:
$$ d = 2 \cdot a $$After substituting $ d = 10 $ we have:
$$ 10 = 2 \cdot a $$ $$ a = \dfrac{ 10 }{ 2 } $$ $$ a = 5 $$STEP 2:
The radius of the circumcircle is equal the side of the hexagon. $$ R = 5 $$