Editing Elongated triangular cupola (section)

== Construction ==
The elongated triangular cupola is constructed from a [[hexagonal prism]] by attaching a [[triangular cupola]] onto one of its bases, a process known as the [[Elongation (geometry)|elongation]].{{r|rajwade}} This cupola covers the hexagonal face so that the resulting polyhedron has four [[equilateral triangle]]s, nine [[square]]s, and one [[regular hexagon]].{{r|berman}} A [[convex set|convex]] polyhedron in which all of the faces are [[regular polygon]]s is the [[Johnson solid]]. The elongated triangular cupola is one of them, enumerated as the eighteenth Johnson solid <math> J_{18} </math>.{{r|francis}}