Symmetry — MATHS STD 7 — Question

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 called a lateral face.
It is a conic solid with the polygonal base.
A pyramid with an $n$ - sided base has $n + 1$ vertices, $n + 1$ faces, and $2n$ edges.
All pyramids are self - dual.