Question 72
All $ABCDEF$ a convex hexagon. We denote by $A'$, $B'$, $C'$, $D'$, $E'$, $F'$ the means of the sides $AB$, $BC$, $CD$, $DE$, $EF$, $FA$ respectively. The triangles are known $ABC'$, $BCD'$, $CDE'$, $DEF'$, $EFA'$, $FAB'$. . Find the hexagon area $ABCDEF$.