Outer face
= Outer face
The <outer face> is the unique unbounded <face of a plane graph> for a finite <plane graph>. It counts once even though it surrounds the whole <graph drawing>. A <tree> has only this <face of a plane graph>.
= Outer face
The <outer face> is the unique unbounded <face of a plane graph> for a finite <plane graph>. It counts once even though it surrounds the whole <graph drawing>. A <tree> has only this <face of a plane graph>.