Elongated Triangular Pyramid

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More things to try:

• elongated triangular pyramid
• (3+(1-sqrt(2))/(1+sqrt(2)))^(1/3)
• diameter of a nonagon with apothem 4

References

Weisstein, E. W. "Johnson Solids." Mathematica package JohnsonSolids.m.

Cite this as:

Weisstein, Eric W. "Elongated Triangular Pyramid." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ElongatedTriangularPyramid.html

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