There are an infinite number of such polyhedra. Starting with a tetrahedron (triangular base), the next up is the quadrilateral pyramid (quadrilateral base), then the pentagonal pyramid, the hexagonal pyramid and so on.
User Defined Regions are a way of allowing a user to write directives around arbitrary segments of code which will allow these segments of code to be folded around. User Defined regions are regions that are defined by special product or service. They are often inside of other larger physicals, human and functional regions.
Two: interior and exterior.
Volume - measured in cubic meters, cubic centimeters, etc.APEX height, length, and width
An arrangement of polygonal regions could be called a tessellation. This usually occurs when these regions are placed over a plane. The shapes in these regions are usually hexagons, equilateral triangles, and squares.
Those areas bounded by the Artic Circle