Area of hexagon given apothem. (The line that is 5 rad 3)
The apothem is perpendicular to the side of the hexagon, forming a triangle with the corner of the hexagon. The angle measurement of the corner is 60 degrees because the angle measurement of any interior angle of a regular hexagon is 120. this means that the imaginary triangle connecting the apothem to the closest corner and that to the center is a 30-60-90 triangle.
The sides of a 30-60-90 triangle are
a (the shortest side)= x
b (The longer leg/ apothem in this scenario)= x rad 3