Category:Definitions/Concave Polyhedra

This category contains definitions related to Concave Polyhedra.
Related results can be found in Category:Concave Polyhedra.

Let $P$ be a polyhedron.

Definition 1

$P$ is a concave polyhedron if and only if:

at least one face of $P$ lies in a plane which intersects at least one other face.

Definition 2

$P$ is a concave polyhedron if and only if:

at least one face of $P$ lies in a plane such that $P$ does not lie completely on one side of that plane.