Question

the ratio of the radii 3:4. Find the ratio of their areas​

Answer 1

$\frac{r1}{r2} = \frac{3}{4} \\ \frac{a1}{a2} = \frac{\pi {r1}^{2} }{\pi {r2}^{2} } \\ \frac{a1}{a2} = ( { \frac{3}{4} })^{2} \\ \frac{a1}{a2} = \frac{9}{16}$

Therefore, ratio of there areas = 9:16