सही विकल्प है: (B) 2 : 3
Given:
The circumference of two circles are in the ratio 2 : 3.
Let the radius of the circles be \(r_1\) and \(r_2.\)
\(\frac{c_1}{c_2} =\frac{2}{3} \)
\(\frac{2 \pi r_1}{2 \pi r_2} =\frac{2}{3} \)
\(\frac{r_1}{r_2} =\frac{2}{3} \)
\(r_1: r_2 =2: 3\)