Pentagonal pyramid
2nd Johnson solid (6 faces) / From Wikipedia, the free encyclopedia
In geometry, pentagonal pyramid is a pyramid with a pentagon base and five triangular faces, having a total of six faces. If all of the edges are equal in length, the triangular faces are equilateral, and this pyramid is the second Johnson solid . The pentagonal pyramid can be found in many polyhedrons, especially in constructing new polyhedra. Its structure can be used in stereochemistry.