Elongated triangular pyramid: Difference between revisions

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In [[geometry]], the '''elongated triangular pyramid''' is one of the [[Johnson solid]]s (''J''₇). [[Norman Johnson (mathematician)|Norman Johnson]] discovered elongated triangular pyramids. 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 polyhedron|dual]].

The 92 Johnson solids were named and described by [[Norman Johnson (mathematician)|Norman Johnson]] in 1966.

==Formulae==

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<math>A=(3+\sqrt{3})a=4.73205...a</math>

If the edges are not the same length, use the individual formulae for the the tetrahedron and triangular prism separately, and then, add the results together.

==External links==