Question

4. The ratio of radii of two circles is 8:9. Find
the ratio of their circumferences and also
find the ratio of their areas.​

Answer 1

Answer:

Ratio of circumference= 8:9

Ratio of area= 64 : 81

Step-by-step explanation:

$\frac{r1}{r2}=\frac{8}{9}\\\\Circumference \: of \:circle = 2\pi r\\ \frac{2\pi r1}{2\pi r2}=\frac{r1}{r2}=\frac{8}{9}\\\\ Area \: of \: circle = \pi r^{2}\\\frac{\pi (r1)^{2}}{\pi (r2)^{2}} = \frac{(r1)^2}{(r2)^2}={(\frac{r1}{r2})}^2 =(\frac{8}{9})^2=\frac{64}{81}$