Pentagonal pyramid

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Pentagonal pyramid

Dbpedia

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In geometry, a pentagonal pyramid is a pyramid with a pentagonal base upon which are erected five triangular faces that meet at a point (the vertex). Like any pyramid, it is self-dual. The regular pentagonal pyramid has a base that is a regular pentagon and lateral faces that are equilateral triangles. It is one of the Johnson solids (J2). It can be seen as the "lid" of an icosahedron; the rest of the icosahedron forms a gyroelongated pentagonal pyramid, J11 More generally an order-2 vertex-uniform pentagonal pyramid can be defined with a regular pentagonal base and 5 isosceles triangle sides of any height.

English Wikipedia http://en.wikipedia.org/wiki/Pentagonal_pyramid

Spanish wikipedia http://es.wikipedia.org/wiki/Pirámide_pentagonal

Wiki page external link http://www.georgehart.com/virtual-polyhedra/vrml/pentagonal_pyramid_(J2).wrl http://www.georgehart.com/virtual-polyhedra/vp.html