Area of hexagon= 2r*6*2r/2 --> apothem X perimeter / 2
= 12r2 ( it meant squared but I'm on iPhone now it's diff for me to type >_<)
so fraction = pi r squared ( area of circle) / 12r2
= pi/12
So √a/b = 1/12
a= b sq / 144
ab = b cube / 144 ????
The answer sounds wrong though... =\