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In [[geometry]], the '''elongated triangular pyramid''' is one of the [[Johnson solid]]s (''J''<sub>7</sub>). [[Norman Johnson (mathematician)|Norman Johnson]] discovered elongated triangular pyramids.{{Citation needed|seems a silly claim|date=November 2010}} 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 topologically (but not geometrically) self-[[dual polyhedron|dual]].
The 92 Johnson solids were named and described by Norman Johnson in 1966.
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