Answer:
6 m
Step-by-step explanation:
The volume of a cone is found by [tex]\frac{\pi r^2h}{3}[/tex], so we can plug the values in to get 6pi * r^2 / 3 = 72pi, or 6pi * r^2 = 216 pi, so r^2 = 36 and the radius is 6 m.
