An elongated triangular pyramid is formed by adjoining a triangular pyramid and a triangular prism along a common
triangular base.
The convex equilateral form with regular polygonal faces
is the Johnson solid 
.
It has 7 polyhedron vertices, 12 polyhedron edges, and 7 faces. The faces
consist of 4 equilateral triangles and 3
squares (McCooey).
See also
Elongated Pyramid,
Triangular
Prism,
Triangular Pyramid
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References
Johnson, N. W. "Convex Polyhedra with Regular Faces." Canad. J. Math. 18, 169-200, 1966. https://doi.org/10.4153/CJM-1966-021-8.McCooey,
D. I. "Elongated Triangular Pyramid." https://dmccooey.com/polyhedra/ElongatedTriangularPyramid.html.Referenced
on Wolfram|Alpha
Elongated Triangular Pyramid
Cite this as:
Weisstein, Eric W. "Elongated Triangular Pyramid."
From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ElongatedTriangularPyramid.html
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