Tetrated dodecahedron

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Short description: Near-miss Johnson solid with 28 faces
Tetrated dodecahedron
Tetrated dodecahedron.svg
TypeNear-miss Johnson solid
Faces4 equilateral triangles
12 isosceles triangles
12 pentagons
Edges54
Vertices28
Vertex configuration4 (5.5.5)
12 (3.5.3.5)
12 (3.3.5.5)
Symmetry groupTd
Propertiesconvex
Net
TetratedDodeca flat.png

File:Tetrated dodecahedron.stl

Model built with polydron

In geometry, the tetrated dodecahedron is a near-miss Johnson solid. It was first discovered in 2002 by Alex Doskey. It was then independently rediscovered in 2003, and named, by Robert Austin.[1]

It has 28 faces: twelve regular pentagons arranged in four panels of three pentagons each, four equilateral triangles (shown in blue), and six pairs of isosceles triangles (shown in yellow). All edges of the tetrated dodecahedron have the same length, except for the shared bases of these isosceles triangles, which are approximately 1.07 times as long as the other edges. This polyhedron has tetrahedral symmetry.

Topologically, as a near-miss Johnson solid, the four triangles corresponding to the face planes of a tetrahedron are always equilateral, while the pentagons and the other triangles only have reflection symmetry.

Related polyhedra

Dodecahedron
(Platonic solid)
Icosidodecahedron
(Archimedean solid)
Pentagonal
orthobirotunda

(Johnson solid)
Dodecahedron.png Icosidodecahedron.png Pentagonal orthobirotunda solid.png
Dodecahedron flat.svg Icosidodecahedron flat.svg Johnson solid 34 net.png

See also

Notes