» Pyramid (geometry)
In geometry, a pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle. It is a conic solid with polygonal base. Pyramids can have from three to a virtually unlimited amount of sides. An n-sided pyramid will have n+1 vertices, n+1 faces, and 2n edges. All pyramids are self-dual. When unspecified, the base is usually assumed to be square. If the base is a regular polygon and the apex is above the center the polygon, an n-gonal pyramid will has Cnv symmetry. Pyramids are a subclass of the prismatoids.
