Question

the ratio of their radii of two circles is 1 ratio 3 their area are in the ratio of​

Answer 1

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Let the ratios of radii of two circles be r and r1

=)r : r1=1:3

$\frac{r}{r1} = \frac{1}{3}$

Hence their ratio of areas are:-

$= > \frac{\pi \: {r}^{2} }{\pi \: (r 1)^{2} }$

$= > \frac{\pi(1) {}^{2} }{\pi(3) {}^{2} }$

$= > \frac{1}{9}$

Hence ratio :- 1:9

Answer 2

Area of a circle is proportional to (radius)(radius)