The area of a large circle is 9 times the area of a small circle. How many times as long is the radius of the large circle compared with the radius of the small circle?

Question

accessdenied · Answer

I would use the ratio of areas and take the positive square root to find the ratio of dimensions.

Ratio of Areas: 9A/A = 9/1

anonymous · Answer

3 times! to find the area of a circle the radius is r^2 so: pi*r^2=9*pi*R^2 if you solve it you'll find r=3R

anonymous · Answer

Alright, thank you both :)

accessdenied · Answer

You're welcome.  :)