In mathematics,      [                                ]
a geometric inequality
of the surface area of
a set & its volume;
in n-dimensional space  
the inequality lower
bounds the surface area
of a set by its volume

                                a one-dimensional sphere
is the surface of what is
commonly called a circle,
while such a circle's interior
& surface together are the
two-dimensional ball; Similarly,
a two-dimensional sphere
is the surface of the Euclidean
solid known colloquially
as a sphere, while the interior
& surface together constitute the
                              three-dimensional ball