Answer:
The big circle has 9 times the area of the smaller circle.
Step-by-step explanation:
We can set up a proportion, where r is the radius of the big circle. That means the smaller circle would have a radius of r/3. By the area formula for a circle we know that A=πr², so the radius for both would be squared, which gives us r² for the big one and r²/9 for the smaller one. It then becomes clear that the ratio between the two areas is 9 times.
