Regular Polygon...
vertex
The apex is located above the centre of the base.
pyramid and coneIn the list given, only the cone and pyramid have a vertex.
The slant height of a square pyramid is always perpendicular to the base. It is form the top vertex all the way down to the most center of one side of the base edge.
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.
A regular pyramid has a regular polygon base and a vertex over the center of the base. By:Cherrylvr :)
regular pyramid
vertex
Yes
Yes.
A regular pyramid has an equilateral triangle base, not just a regular polygon. It has an apex above the centre of the base.
Vertex
In general, an octagonal pyramid is a pyramid with an octagon for a base and triangles (which all have a common vertex) for sides. The octagon my or may not be a regular one.
The apex.
The apex is located above the centre of the base.
pyramid and coneIn the list given, only the cone and pyramid have a vertex.
Yes. This vertex is also known as the apex.