Answer
Please see the work below.
Work Step by Step
We know that the radius of the nucleus is given as $r=(1.22\times 10^{-15}m)A^{\frac{1}{3}}$. This shows that the radius depends on the mass number A, or the total number of nucleons in the nucleus. Thus, the nucleus of A and B will have equal radii if they have an equal number of total nucleons.
