We study the distribution of the distance of a pair of independent random points selected uniformly in concentric spherical shells in R d .Additionally, we rederive the distribution of the distance between two random points in a ball selected according to the beta distribution.Finally, we also consider the distance between two points following a beta distribution in a concentric spherical shell in some special cases for and d.
Bakó‐Szabó et al. (Thu,) studied this question.