Two-dimensional object
an intersection of two faces
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an edge of a polyhedron that is not a base edge
A net is an arrangement of polygons, joined edge-to-edge, that when folded up, form the surface of a polyhedron.
yes it is a polyhedron
no a cuboid is not a polyhedron if it was it would have 9 faces
It is not a regular polyhedron because it has unequal sides