It could be any polygon.
Any polygon can be a face of a polyhedron.
It can be any polygon.
Yes. A base on a polyhedron is a face and a base on a polygon is a side.
Any polygon can be the base of a pyramid and so any polygon can form a polyhedron.
pyramid
its a 3-d trangle and i want to know if its a polygon or a polyhedron
No. A polyhedron is a three dimensional body. The base of a pyramid is a two dimensional figure.But any non self-intersecting polygon can be the base of a pyramid.
There is no specific name nor a specific shape for such a polygon.
An antiprism is a polyhedron consisting of two parallel copies of some polygon, connected by an alternating band of triangles.
A pyramid seems to fit the description.
Any that you like.Any that you like.Any that you like.Any that you like.
The answer depends on the context. The base in an exponential term is quite different to that in a polygon or a polyhedron. A base in chemistry is even more different.