An elongated triangular cupola is
Johnson solid
.
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References
Weisstein, E. W. "Johnson Solids."
Mathematica package JohnsonSolids.m.Referenced
on Wolfram|Alpha
Elongated Triangular Cupola
Cite this as:
Weisstein, Eric W. "Elongated Triangular Cupola."
From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ElongatedTriangularCupola.html
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