The net of a donut-shaped polyhedron
The net of a polyhedron that is, from the point of view of topology, equivalent to a torus.
Euler's relation doesn't hold for this polyhedron; instead, we have Vertices - Edges + Faces = 0.
© matematita
The image belongs to the sections...:
The torus (Topology)
Polyhedra of positive genus (3D geometry)
Nets for polyhedra (3D geometry)