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The ratio of the radii of two circles is 1 : 3. Then the ratio of their areas is :
Answer & Solution
Correct Answer:
Option
C
Let the radii of the two circle be r and 3r respectively.
Then, required ratio :
$$ = \frac{{\pi {r^2}}}{{\pi {{\left( {3r} \right)}^2}}} = \frac{{\pi {r^2}}}{{9\pi {r^2}}} = 1:9$$
Then, required ratio :
$$ = \frac{{\pi {r^2}}}{{\pi {{\left( {3r} \right)}^2}}} = \frac{{\pi {r^2}}}{{9\pi {r^2}}} = 1:9$$
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