No, because a polyhedron is a solid with many flat faces. A heptagon is not a 3-D figure.
However, a pyramid or prism would be a polyhedron.
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A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
No, they are the faces of the polyhedron.
heptagon
It is called a Heptagon.
A heptagon with anything other than 7 sides is not an heptagon!