About the Book
This book consists of articles from Wikia. Pages: 48. Chapters: Deltahedra, Prismatoid polyhedra, Pyramids, Pyramids and bipyramids, Trapezohedra, Bipyramid, Decagonal bipyramid, Deltahedron, Gyroelongated dipyramid, Hexagonal bipyramid, Icosahedron, Octagonal bipyramid, Octahedron, Pentagonal dipyramid, Tetrahedron, Triangular dipyramid, Antiprism, Archimedean solid, Bicupola, Bifrustum, Bipyramid, Cube, Cuboid, Decagonal bipyramid, Deltahedron, Dodecahedron, Dual polyhedron, Elongated dipyramid, Frustum, Gyroelongated dipyramid, Heronian tetrahedron, Hexagonal bipyramid, Icosahedron, Inscribed sphere, Johnson solid, Midsphere, Octagonal bipyramid, Octahedron, Pentagonal bifrustum, Platonic solid, Polyhedron, Prism, Pyramid, Semiregular polyhedron, Tetrahedron, Trapezohedron, Truncated trapezohedron, Anticube, Antiprism, Cube, Cuboid, Frustum, Hexagonal prism, Octahedron, Pentagonal antiprism, Pentagonal prism, Pentagonal pyramid, Prism, Pyramid, Square pyramid, Tetrahedron, Triangular prism, Pyramid, Square pyramidal number, Bipyramid, Decagonal bipyramid, Elongated dipyramid, Gyroelongated dipyramid, Hexagonal bipyramid, Icosahedron, Octagonal bipyramid, Octahedron, Pentagonal dipyramid, Pentagonal pyramid, Pyramid, Square pyramid, Tetrahedron, Triangular dipyramid, Cube, Cuboid, Parallelepiped, Square bifrustum, Trapezohedron. Excerpt: An n-gonal bipyramid or dipyramid is a polyhedron formed by joining an n-gonal pyramid and its mirror image base-to-base. The referenced n-gon in the name of the bipyramids is not an external face but an internal one, existing on the primary symmetry plane which connects the two pyramid halves. The face-transitive bipyramids are the dual polyhedra of the uniform prisms and will generally have isosceles triangle faces. A bipyramid can be projected on a sphere or globe as n equally spaced lines of longitude going from pole to pole, and bisected by a line around the equator. Bipyramid faces, projected as spherical triangles, repr...
