Two-dimensional object
an intersection of two faces
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
No, they are the faces of the polyhedron.
an edge of a polyhedron that is not a base edge
When two faces of a polyhedron share a side, they form an edge. This edge is a line segment where the two faces meet. Each edge connects two vertices and contributes to the overall structure of the polyhedron. The arrangement of these edges, along with the faces and vertices, defines the shape of the polyhedron.
An edge.
It is an edge.
A polyhedron as for example a pyramid
EDGE
an edge.
An edge.
A net is an arrangement of polygons, joined edge-to-edge, that when folded up, form the surface of a polyhedron.
It is unlikely that the question is about a polyhedron which is a 3-dimensional solid bounded by polygons. The minimum number of edges for a polyhedron is 6: the question appears to suggest just 4.
That would be classified as an edge.