Question

How many different geometric models can be defined as a pyramid?

Answer 1

See below

Explanation:

Pyramid is a three-dimensional geometric object bounded by a polygon at the base and all triangular sides formed by connecting its single top point lying outside a base plane with vertices of the polygon at the base.

Pyramid types can be classified by the number of vertices of a base polygon (for instance, "triangular pyramid" is the one with a triangle at its base).

If a polygon at the base is a regular polygon and the top point of a pyramid lies on a perpendicular to a base plane from the center of a base polygon, pyramid is considered "regular".