  It is conjectured that stationary black holes are characterized by the
inverse hoop relation ${\cal A}\leq {\cal C}^2/\pi$, where ${\cal A}$ and
${\cal C}$ are respectively the black-hole surface area and the circumference
length of the smallest ring that can engulf the black-hole horizon in every
direction. We explicitly prove that generic Kerr-Newman-(anti)-de Sitter black
holes conform to this conjectured area-circumference relation.
