Larger Radius is the first upgrade of Path 3 of Ice Monkey in BTD6. It allows the Ice Monkey to increase range by 35% (20 to 27). It costs $85 on Easy, $100 on Medium, $110 on Hard, and $120 on Impoppable.
While in most cases Enhanced Freeze will freeze more bloons, Larger Radius still may be useful in rare cases. Larger Radius also leads into a powerful upgrade, Refreeze that comboes well with Enhanced Freeze for a permanent stall.