312
Because that is how a polyhedron is defined.
Because that is how a polyhedron is defined.
Because that is how a polyhedron is defined.
The side that is curved, when placed by itself (without bending or manipulating in any way), is not a polygon, making the shape not entirely made of polygons. A 3D figure must be made by only polygons to be a polyhedron.
I am not sure that such a surface can exist.
A polyhedron.
A polyhedron
it is a polyhedron.
a polyhedron
Polyhedron.
A polyhedron.
Polyhedron