The ratio of the radii of two circles is 1 : 3. Then the ratio of their areas is :
A. 1 : 3
B. 1 : 6
C. 1 : 9
D. None of these
Answer: Option C
Solution (By Examveda Team)
Let the radii of the two circle be r and 3r respectively.Then, required ratio :
$$ = \frac{{\pi {r^2}}}{{\pi {{\left( {3r} \right)}^2}}} = \frac{{\pi {r^2}}}{{9\pi {r^2}}} = 1:9$$
This Question Belongs to Arithmetic Ability >> Area
Join The Discussion