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elongated square pyramid : ウィキペディア英語版 | elongated square pyramid
In geometry, the elongated square pyramid is one of the Johnson solids (''J''8). As the name suggests, it can be constructed by elongating a square pyramid (''J''1) by attaching a cube to its square base. Like any elongated pyramid, it is topologically (but not geometrically) self-dual. == Dual polyhedron ==
The dual of the elongated square pyramid has 9 faces: 4 triangular, 1 square and 4 trapezoidal.
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