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 self-dual.

The 92 Johnson solids were named and described by Norman Johnson in 1966.

External links

• Johnson Solid -- from MathWorld

Johnson solids | Self-dual polyhedra

正三角錐柱