Question

The circumferences of two circles are 3 m. and 9πm. What is the ratio of the areas of the circle?

Answer 1

If the circumferences of two circles are 3 m and 9πm, then their radiuses are 1.5/π and 4.5 m ($r = c/2\pi$ ).

The ratio of the areas of the circle is:

$\frac{(1.5/π)^2}{4.5^2} = \frac{1}{9π^2}$.