pyramid
A polyhedron with a polygon base and triangular sides that all meet at a common vertex is known as a pyramid. The base can be any polygon, such as a triangle, square, or pentagon, and the triangular sides are called lateral faces. The vertex where all the triangular faces converge is referred to as the apex of the pyramid. Each type of pyramid is named based on the shape of its base, such as a triangular pyramid or a square pyramid.
A pyramid seems to fit the description.
For every polyhedron, there is a dual which is a polyhedron that has:a face where the first had a vertex,a vertex where the first had a face,the same number of edges.A self-dual polyhedron is a polyhedron whose dual is the same shape.All pyramids, for example, are self-dual.
It may be called an apex, but that is really only appropriate for a simple convex polyhedron.
A polyhedron with a polygon base and triangular sides that all meet at a common vertex is called a pyramid. The base can be any polygon (such as a triangle, square, or pentagon), and the triangular faces connect each edge of the base to the apex or common vertex at the top. Pyramids are named based on the shape of their base; for example, a pyramid with a square base is called a square pyramid.
A pyramid has a polygonal base with all other sides being triangles. As the Egyptians famously demonstrated, a common pyramid has a square base with four triangles meeting at a vertex, but any polygon - regular or irregular - can be used as the base of such a polyhedron.
pyramid An pyramid is a geometric solid of the shape made famous by the royal tombs of ancient Egypt. It is a solid whose base is a polygon and whose lateral faces are triangles with a common vertex
A polyhedron of which one face is a square, and the other faces are triangles with a common vertex.
A pyramid
A polyhedron of which one face is a polygon of any number of sides, and the other faces are triangles with a common vertex.
A polyhedron with a polygon base and triangular sides that all meet at a common vertex is known as a pyramid. The base can be any polygon, such as a triangle, square, or pentagon, and the triangular sides are called lateral faces. The vertex where all the triangular faces converge is referred to as the apex of the pyramid. Each type of pyramid is named based on the shape of its base, such as a triangular pyramid or a square pyramid.
A pyramid seems to fit the description.
A pyramid fits the given description
a pyramid
Assuming you are talking about two triangles, "meet at a side" means they have a shared side. This side has two vertices, each of which is a vertex of both triangles. However, if the triangles only share one vertex, so that the tip of one triangle touches the tip of the other, they will have no side in common.
For every polyhedron, there is a dual which is a polyhedron that has:a face where the first had a vertex,a vertex where the first had a face,the same number of edges.A self-dual polyhedron is a polyhedron whose dual is the same shape.All pyramids, for example, are self-dual.
The given description fits that of a triangular based pyramid which has 4 faces, 6 edges and 4 vertices