Question

The ratio between the diameters of two circles is $3:5$, then find the ratio their radii.

• A. $3:5$
• B. $2:5$
• C. $7:5$
• D. $9:5$

Answer 1

The correct option is A $3:5$

Given, the ratio of diameters $=3:5$.

We know, diameter = $2\times$ radius.

Therefore, ratio of radii$=2\times 3:2\times 5=3:5$.

Thus, ratio of diameter = ratio of radius.

$\therefore$ ratio of radius $=3:5$.

Hence, option $A$ is correct.