The formula for determining the apothem of regular hexagon is s/2tan(180/n) , where 's' is any side length of regular hexagon and 'n' is the number of sides of regular hexagon. So, apothem = 17/2tan(180/n) = 17/2tan(30) = 17/1.15 = 14.78 units Therefore, the measure of apothem of the regular hexagon is 14.7 units. B is the right answer.
