Asap pls. the diagram below shows a rectangle inside a regular hexagon. the apothem of the hexagon is 15.59 units. to the nearest square unit what is the area of the shaded region

We know that
area of the shaded region=area of a regular  hexagon-area of the rectangle

find the area of the rectangle
Area rectangle=18*21> 378 units²

find the area of a regular hexagon
area of regular hexagon=n*L*apothem/2
where
n is the number of sides> n=6
L is the long side of the hexagon> L=18 units
apothem=15.59 units
area of regular hexagon=6*18*15.59/2> 841.86 units²

area of the shaded region=841.86-378> 463.86> 464 units²

the answer is
464 units²