Editing Elongated triangular bipyramid (section)

== Construction ==
The elongated triangular bipyramid is constructed from a [[triangular prism]] by attaching two [[tetrahedron]]s onto its bases, a process known as the [[Elongation (geometry)|elongation]].{{r|rajwade}} These tetrahedrons cover the triangular faces so that the resulting polyhedron has nine faces (six of them are [[equilateral triangle]]s and three of them are [[square]]s), fifteen edges, and eight vertices.{{r|berman}} A [[Convex set|convex]] polyhedron in which all of the faces are [[regular polygon]]s is the [[Johnson solid]]. The elongated bipyramid is one of them, enumerated as the fourteenth Johnson solid <math> J_{14} </math>.{{r|uehara}}