Since it'll be rolling around the outside of the circle, the distance traveled will be in some multiple of the circumference. So, dividing the distance by the circumference will give the answer.
C = πD = 6π
revolutions = distance / circumference = 108π / 6π = 18 revolutions
The curved surface area is 108pi m2
Equation for the area circle = pi x radius squared If the area is 144pi, then you need to find the square root of 144, which is 12. Therefore, radius = 12
As a cell becomes larger, its volume increases faster than its surface area. This results in a decrease in the surface area to volume ratio. A high surface area to volume ratio is important for efficient exchange of nutrients and waste with the cell's environment.