  We prove the following three statements: 1) Let $(A, \bar A)$ be a partition
of the spherical surface $S^n$ into two measurable sets. Let $st_A$ and
$st_{\bar A}$ be their measure density functions of distance. Then $|st_A -
st_{\bar A}|$ depends only on the difference of their $n$-areas. 2) If the
spherical surface $S^n$ is divided in two measurable subsets $A$ and $\bar A$
of equal $n$-surface, then these two subsets have the same distribution of
distance. 3) Let there be a pair $(S, S')$ of subsets of a sphere $S^{n}$ such
that $st_S = st_{S'}$. Then their complementary subsets satisfy $st_{\bar S} =
st_{\bar S'}$ and $st_{S, \bar S} = st_{S', \bar S'}$, where $st_{A, B}$ is the
measure density function of distance between a point in $A$ and a point in $B$.
Furthermore, it is shown that the statements remain true when $S^n$ is
substituted by the Cartesian product $S^{n_1} \times ... \times S^{n_r}$
endowed with the metric which is naturally inherited from its factors.
