The ratio of the radii of two circle is 3 : 2. What is the ratio of their circumferences ?

A. 2 : 3

B. 3 : 2

C. 4 : 9

D. None of these

Answer: Option B

Solution(By Examveda Team)

Let the radii of the two circle be 3r and 2r respectively
Then, required ratio :
$$\eqalign{ & = \frac{{2\pi \left( {3r} \right)}}{{2\pi \left( {2r} \right)}} \cr & = \frac{3}{2} \cr & = 3:2 \cr} $$