Elongated triangular pyramid

Elongated triangular pyramid
Type	Johnson J6 – J7 – J8
Faces	4 triangles 3 squares
Edges	12
Vertices	7
Vertex configuration	${\begin{aligned}&1\times (3^{3})+\\&3\times (3\times 4^{2})+\\&3\times (3^{2}\times 4^{2})\end{aligned}}$
Symmetry group	$C_{3\mathrm {v} }$ of order six
Dihedral angle (degrees)	triangle-to-triangle: 70.5° square-to-square: 60° square-to-triangle: 160.5°
Dual polyhedron	self-dual
Properties	convex, composite
Net

3D model of an elongated triangular pyramid

In geometry, the elongated triangular pyramid is one of the Johnson solids (J₇). As the name suggests, it can be constructed by elongating a tetrahedron by attaching a triangular prism to its base. Like any elongated pyramid, the resulting solid is topologically (but not geometrically) self-dual.