List of Johnson solids

From The Right Wiki
Jump to navigationJump to search

In geometry, polyhedra are three-dimensional objects where points are connected by lines to form polygons. The points, lines, and polygons of a polyhedron are referred to as its vertices, edges, and faces, respectively.[1] A polyhedron is considered to be convex if:[2]

  • The shortest path between any two of its vertices lies either within its interior or on its boundary.
  • None of its faces are coplanar—they do not share the same plane and do not "lie flat".
  • None of its edges are colinear—they are not segments of the same line.

A convex polyhedron whose faces are regular polygons is known as a Johnson solid, or sometimes as a Johnson–Zalgaller solid. Some authors exclude uniform polyhedra from the definition. A uniform polyhedron is a polyhedron in which the faces are regular and they are isogonal; examples include Platonic and Archimedean solids as well as prisms and antiprisms.[3] The Johnson solids are named after American mathematician Norman Johnson (1930–2017), who published a list of 92 such polyhedra in 1966. His conjecture that the list was complete and no other examples existed was proven by Russian-Israeli mathematician Victor Zalgaller (1920–2020) in 1969.[4] Some of the Johnson solids may be categorized as elementary polyhedra, meaning they cannot be separated by a plane to create two small convex polyhedra with regular faces. The Johnson solids satisfying this criteria are the first six—equilateral square pyramid, pentagonal pyramid, triangular cupola, square cupola, pentagonal cupola, and pentagonal rotunda. The criteria is also satisfied by eleven other Johnson solids, specifically the tridiminished icosahedron, parabidiminished rhombicosidodecahedron, tridiminished rhombicosidodecahedron, snub disphenoid, snub square antiprism, sphenocorona, sphenomegacorona, hebesphenomegacorona, disphenocingulum, bilunabirotunda, and triangular hebesphenorotunda.[5] The rest of the Johnson solids are not elementary, and they are constructed using the first six Johnson solids together with Platonic and Archimedean solids in various processes. Augmentation involves attaching the Johnson solids onto one or more faces of polyhedra, while elongation or gyroelongation involve joining them onto the bases of a prism or antiprism, respectively. Some others are constructed by diminishment, the removal of one of the first six solids from one or more of a polyhedron's faces.[6] The following table contains the 92 Johnson solids, with edge length a. The table includes the solid's enumeration (denoted as Jn).[7] It also includes the number of vertices, edges, and faces of each solid, as well as its symmetry group, surface area A, and volume V. Every polyhedron has its own characteristics, including symmetry and measurement. An object is said to have symmetry if there is a transformation that maps it to itself. All of those transformations may be composed in a group, alongside the group's number of elements, known as the order. In two-dimensional space, these transformations include rotating around the center of a polygon and reflecting an object around the perpendicular bisector of a polygon. A polygon that is rotated symmetrically by 360n is denoted by Cn, a cyclic group of order n; combining this with the reflection symmetry results in the symmetry of dihedral group Dn of order 2n.[8] In three-dimensional symmetry point groups, the transformations preserving a polyhedron's symmetry include the rotation around the line passing through the base center, known as the axis of symmetry, and the reflection relative to perpendicular planes passing through the bisector of a base, which is known as the pyramidal symmetry Cnv of order 2n. The transformation that preserves a polyhedron's symmetry by reflecting it across a horizontal plane is known as the prismatic symmetry Dnh of order 4n. The antiprismatic symmetry Dnd of order 4n preserves the symmetry by rotating its half bottom and reflection across the horizontal plane.[9] The symmetry group Cnh of order 2n preserves the symmetry by rotation around the axis of symmetry and reflection on the horizontal plane; the specific case preserving the symmetry by one full rotation is C1h of order 2, often denoted as Cs.[10] The mensuration of polyhedra includes the surface area and volume. An area is a two-dimensional measurement calculated by the product of length and width; for a polyhedron, the surface area is the sum of the areas of all of its faces.[11] A volume is a measurement of a region in three-dimensional space.[12] The volume of a polyhedron may be ascertained in different ways: either through its base and height (like for pyramids and prisms), by slicing it off into pieces and summing their individual volumes, or by finding the root of a polynomial representing the polyhedron.[13]

The 92 Johnson solids
Jn Solid name Image Vertices Edges Faces Symmetry group and its order[14] Surface area and volume[15]
1 Equilateral square pyramid File:Square pyramid.png 5 8 5 C4v of order 8 A=(1+3)a22.7321a2V=26a30.2357a3
2 Pentagonal pyramid File:Pentagonal pyramid.png 6 10 6 C5v of order 10 A=a2252(10+5+75+305)3.8855a2V=(5+524)a30.3015a3
3 Triangular cupola File:Triangular cupola.png 9 15 8 C3v of order 6 A=(3+532)a27.3301a2V=(532)a31.1785a3
4 Square cupola File:Square cupola.png 12 20 10 C4v of order 8 A=(7+22+3)a211.5605a2V=(1+223)a31.9428a3
5 Pentagonal cupola File:Pentagonal cupola.png 15 25 12 C5v of order 10 A=(14(20+53+5(145+625)))a216.5798a2V=(16(5+45))a32.3241a3
6 Pentagonal rotunda File:Pentagonal rotunda.png 20 35 17 C5v of order 10 A=(12(53+10(65+295)))a222.3472a2V=(112(45+175))a36.9178a3
7 Elongated triangular pyramid File:Elongated triangular pyramid.png 7 12 7 C3v of order 6 A=(3+3)a24.7321a2V=(112(2+33))a30.5509a3
8 Elongated square pyramid File:Elongated square pyramid.png 9 16 9 C4v of order 8 A=(5+3)a26.7321a2V=(1+26)a31.2357a3
9 Elongated pentagonal pyramid File:Elongated pentagonal pyramid.png 11 20 11 C5v of order 10 A=20+53+25+1054a28.8855a2V=(5+5+625+10524)a32.022a3
10 Gyroelongated square pyramid File:Gyroelongated square pyramid.png 9 20 13 C4v of order 8 A=(1+33)a26.1962a2V=16(2+24+32)a31.1927a3
11 Gyroelongated pentagonal pyramid File:Gyroelongated pentagonal pyramid.png 11 25 16 C5v of order 10 A=14(153+5(5+25))a28.2157a2V=124(25+95)a31.8802a3
12 Triangular bipyramid File:Triangular dipyramid.png 5 9 6 D3h of order 12 A=332a22.5981a2V=26a30.2358a3
13 Pentagonal bipyramid File:Pentagonal dipyramid.png 7 15 10 D5h of order 20 A=532a24.3301a2V=112(5+5)a30.603a3
14 Elongated triangular bipyramid File:Elongated triangular dipyramid.png 8 15 9 D3h of order 12 A=32(2+3)a25.5981a2V=112(22+33)a30.6687a3
15 Elongated square bipyramid File:Elongated square dipyramid.png 10 20 12 D4h of order 16 A=2(2+3)a27.4641a2V=13(3+2)a31.4714a3
16 Elongated pentagonal bipyramid File:Elongated pentagonal dipyramid.png 12 25 15 D5h of order 20 A=52(2+3)a29.3301a2V=112(5+5+35(5+25))a32.3235a3
17 Gyroelongated square bipyramid File:Gyroelongated square dipyramid.png 10 24 16 D4d of order 16 A=43a26.9282a2V=13(2+4+32)a31.4284a3
18 Elongated triangular cupola File:Elongated triangular cupola.png 15 27 14 C3v of order 6 A=12(18+53)a213.3301a2V=16(52+93)a33.7766a3
19 Elongated square cupola File:Elongated square cupola.png 20 36 18 C4v of order 8 A=(15+22+3)a219.5605a2V=(3+823)a36.7712a3
20 Elongated pentagonal cupola File:Elongated pentagonal cupola.svg 25 45 22 C5v of order 10 A=14(60+53+105+25+5(5+25))a226.5798a2V=16(5+45+155+25)a310.0183a3
21 Elongated pentagonal rotunda File:Elongated pentagonal rotunda.png 30 55 27 C5v of order 10 A=12a2(20+53+55+25+35(5+25))32.3472a2V=112a3(45+175+305+25)14.612a3
22 Gyroelongated triangular cupola File:Gyroelongated triangular cupola.png 15 33 20 C3v of order 6 A=12(6+113)a212.5263a2V=13612+183+301+3a33.5161a3
23 Gyroelongated square cupola File:Gyroelongated square cupola.png 20 44 26 C4v of order 8 A=(7+22+53)a218.4887a2V=(1+232+234+22+2146+1032)a36.2108a3
24 Gyroelongated pentagonal cupola File:Gyroelongated pentagonal cupola.png 25 55 32 C5v of order 10 A=14(20+253+105+25+5(5+25))a225.2400a2V=(56+235+562650+2905252)a39.0733a3
25 Gyroelongated pentagonal rotunda File:Gyroelongated pentagonal rotunda.png 30 65 37 C5v of order 10 A=12(153+(5+35)5+25)a231.0075a2V=(4512+17125+562650+2905252)a313.6671a3
26 Gyrobifastigium File:Gyrobifastigium.png 8 14 8 D2d of order 8 A=(4+3)a25.7321a2V=(32)a30.866a3
27 Triangular orthobicupola File:Triangular orthobicupola.png 12 24 14 D3h of order 12 A=2(3+3)a29.4641a2V=523a32.357a3
28 Square orthobicupola File:Square orthobicupola.png 16 32 18 D4h of order 16 A=2(5+3)a213.4641a2V=(2+423)a33.8856a3
29 Square gyrobicupola File:Square gyrobicupola.png 16 32 18 D4d of order 16 A=2(5+3)a213.4641a2V=(2+423)a33.8856a3
30 Pentagonal orthobicupola File:Pentagonal orthobicupola.png 20 40 22 D5h of order 20 A=(10+52(10+5+75+305))a217.7711a2V=13(5+45)a34.6481a3
31 Pentagonal gyrobicupola File:Pentagonal gyrobicupola.png 20 40 22 D5d of order 20 A=(10+52(10+5+75+305))a217.7711a2V=13(5+45)a34.6481a3
32 Pentagonal orthocupolarotunda File:Pentagonal orthocupolarotunda.png 25 50 27 C5v of order 10 A=(5+141900+4905+21075+305)a223.5385a2V=512(11+55)a39.2418a3
33 Pentagonal gyrocupolarotunda File:Pentagonal gyrocupolarotunda.png 25 50 27 C5v of order 10 A=(5+1543+7425+105)a223.5385a2V=512(11+55)a39.2418a3
34 Pentagonal orthobirotunda File:Pentagonal orthobirotunda.png 30 60 32 D5h of order 20 A=((53+35(5+25))a229.306a2V=16(45+175)a313.8355a3
35 Elongated triangular orthobicupola File:Elongated triangular orthobicupola.png 18 36 20 D3h of order 12 A=2(6+3)a215.4641a2V=(523+332)a34.9551a3
36 Elongated triangular gyrobicupola File:Elongated triangular gyrobicupola.png 18 36 20 D3d of order 12 A=2(6+3)a215.4641a2V=(523+332)a34.9551a3
37 Elongated square gyrobicupola File:Elongated square gyrobicupola.png 24 48 26 D4d of order 16 A=2(9+3)a221.4641a2V=(4+1023)a38.714a3
38 Elongated pentagonal orthobicupola File:Elongated pentagonal orthobicupola.png 30 60 32 D5h of order 20 A=(20+52(10+5+75+305))a227.7711a2V=16(10+85+155+25)a312.3423a3
39 Elongated pentagonal gyrobicupola File:Elongated pentagonal gyrobicupola.png 30 60 32 D5d of order 20 A=(20+52(10+5+75+305))a227.7711a2V=16(10+85+155+25)a312.3423a3
40 Elongated pentagonal orthocupolarotunda File:Elongated pentagonal orthocupolarotunda.png 35 70 37 C5v of order 10 A=14(60+10(190+495+2175+305))a233.5385a2V=512(11+55+65+25)a316.936a3
41 Elongated pentagonal gyrocupolarotunda File:Elongated pentagonal gyrocupolarotunda.png 35 70 37 C5v of order 10 A=14(60+10(190+495+2175+305))a233.5385a2V=512(11+55+65+25)a316.936a3
42 Elongated pentagonal orthobirotunda File:Elongated pentagonal orthobirotunda.png 40 80 42 D5h of order 20 A=(10+30(10+35+75+305))a239.306a2V=16(45+175+155+25)a321.5297a3
43 Elongated pentagonal gyrobirotunda File:Elongated pentagonal gyrobirotunda.png 40 80 42 D5d of order 20 A=(10+30(10+35+75+305))a239.306a2V=16(45+175+155+25)a321.5297a3
44 Gyroelongated triangular bicupola File:Gyroelongated triangular bicupola.png 18 42 26 D3 of order 6 A=(6+53)a214.6603a2V=2(53+1+3)a34.6946a3
45 Gyroelongated square bicupola File:Gyroelongated square bicupola.png 24 56 34 D4 of order 8 A=(10+63)a220.3923a2V=(2+432+234+22+2146+1032)a38.1536a3
46 Gyroelongated pentagonal bicupola File:Gyroelongated pentagonal bicupola.png 30 70 42 D5 of order 10 A=12(20+153+25+105)a226.4313a2V=(53+435+562650+2905252)a311.3974a3
47 Gyroelongated pentagonal cupolarotunda File:Gyroelongated pentagonal cupolarotunda.png 35 80 47 C5 of order 5 A=14(20+353+725+105)a232.1988a2V=(5512+25125+562650+2905252)a315.9911a3
48 Gyroelongated pentagonal birotunda File:Gyroelongated pentagonal birotunda.png 40 90 52 D5 of order 10 A=(103+325+105)a237.9662a2V=(456+1765+562650+2905252)a320.5848a3
49 Augmented triangular prism File:Augmented triangular prism.png 7 13 8 C2v of order 4 A=12(4+33)a24.5981a2V=112(22+33)a30.6687a3
50 Biaugmented triangular prism File:Biaugmented triangular prism.png 8 17 11 C2v of order 4 A=12(2+53)a25.3301a2V=59144+16a30.9044a3
51 Triaugmented triangular prism File:Triaugmented triangular prism.png 9 21 14 D3h of order 12 A=732a26.0622a2V=22+34a31.1401a3
52 Augmented pentagonal prism File:Augmented pentagonal prism.png 11 19 10 C2v of order 4 A=12(8+23+5(5+25))a29.173a2V=112233+905+1250+205a31.9562a3
53 Biaugmented pentagonal prism File:Biaugmented pentagonal prism.png 12 23 13 C2v of order 4 A=12a2(6+43+5(5+25))9.9051a2V=112a3257+905+2450+2052.1919a3
54 Augmented hexagonal prism File:Augmented hexagonal prism.png 13 22 11 C2v of order 4 A=(5+43)a211.9282a2V=16(2+93)a32.8338a3
55 Parabiaugmented hexagonal prism File:Parabiaugmented hexagonal prism.png 14 26 14 D2h of order 8 A=(4+53)a212.6603a2V=16(22+93)a33.0695a3
56 Metabiaugmented hexagonal prism File:Metabiaugmented hexagonal prism.png 14 26 14 C2v of order 4 A=(4+53)a212.6603a2V=16(22+93)a33.0695a3
57 Triaugmented hexagonal prism File:Triaugmented hexagonal prism.png 15 30 17 D3h of order 12 A=3(1+23)a213.3923a2V=(12+332)a33.3052a3
58 Augmented dodecahedron File:Augmented dodecahedron.png 21 35 16 C5v of order 10 A=14(53+115(5+25))a221.0903a2V=124(95+435)a37.9646a3
59 Parabiaugmented dodecahedron File:Parabiaugmented dodecahedron.png 22 40 20 D5d of order 20 A=52(3+5(5+25))a221.5349a2V=16(25+115)a38.2661a3
60 Metabiaugmented dodecahedron File:Metabiaugmented dodecahedron.png 22 40 20 C2v of order 4 A=52(3+5(5+25))a221.5349a2V=16(25+115)a38.2661a3
61 Triaugmented dodecahedron File:Triaugmented dodecahedron.png 23 45 24 C3v of order 6 A=34(53+35(5+25))a221.9795a2V=58(7+35)a38.5676a3
62 Metabidiminished icosahedron File:Metabidiminished icosahedron.png 10 20 12 C2v of order 4 A=12(53+5(5+25))a27.7711a2V=16(5+25)a31.5787a3
63 Tridiminished icosahedron File:Tridiminished icosahedron.png 9 15 8 C3v of order 6 A=14(53+35(5+25))a27.3265a2V=(58+7524)a31.2772a3
64 Augmented tridiminished icosahedron File:Augmented tridiminished icosahedron.png 10 18 10 C3v of order 6 A=14(73+35(5+25))a28.1925a2V=124(15+22+75)a31.395a3
65 Augmented truncated tetrahedron File:Augmented truncated tetrahedron.png 15 27 14 C3v of order 6 A=12(6+133)a214.2583a2V=1122a33.8891a3
66 Augmented truncated cube File:Augmented truncated cube.png 28 48 22 C4v of order 8 A=(15+102+33)a234.3383a2V=(8+1623)a315.5425a3
67 Biaugmented truncated cube File:Biaugmented truncated cube.png 32 60 30 D4h of order 16 A=2(9+42+23)a236.2419a2V=(9+62)a317.4853a3
68 Augmented truncated dodecahedron File:Augmented truncated dodecahedron.png 65 105 42 C5v of order 10 A=14(20+253+1105+25+5(5+25))a2102.1821a2V=(50512+8154)a387.3637a3
69 Parabiaugmented truncated dodecahedron File:Parabiaugmented truncated dodecahedron.png 70 120 52 D5d of order 20 A=12(20+153+505+25+5(5+25))a2103.3734a2V=112(515+2515)a389.6878a3
70 Metabiaugmented truncated dodecahedron File:Metabiaugmented truncated dodecahedron.png 70 120 52 C2v of order 4 A=12(20+153+505+25+5(5+25))a2103.3734a2V=112(515+2515)a389.6878a3
71 Triaugmented truncated dodecahedron File:Triaugmented truncated dodecahedron.png 75 135 62 C3v of order 6 A=14(60+353+905+25+35(5+25))a2104.5648a2V=712(75+375)a392.0118a3
72 Gyrate rhombicosidodecahedron File:Gyrate rhombicosidodecahedron.png 60 120 62 C5v of order 10 A=(30+53+35(5+25))a259.306a2V=(20+2953)a341.6153a3
73 Parabigyrate rhombicosidodecahedron File:Parabigyrate rhombicosidodecahedron.png 60 120 62 D5d of order 20 A=(30+53+35(5+25))a259.306a2V=(20+2953)a341.6153a3
74 Metabigyrate rhombicosidodecahedron File:Metabigyrate rhombicosidodecahedron.png 60 120 62 C2v of order 4 A=(30+53+35(5+25))a259.306a2V=(20+2953)a341.6153a3
75 Trigyrate rhombicosidodecahedron File:Trigyrate rhombicosidodecahedron.png 60 120 62 C3v of order 6 A=(30+53+35(5+25))a259.306a2V=(20+2953)a341.6153a3
76 Diminished rhombicosidodecahedron File:Diminished rhombicosidodecahedron.png 55 105 52 C5v of order 10 A=14(100+153+105+25+115(5+25))a258.1147a2V=(1156+95)a339.2913a3
77 Paragyrate diminished rhombicosidodecahedron File:Paragyrate diminished rhombicosidodecahedron.png 55 105 52 C5v of order 10 A=14(100+153+105+25+115(5+25))a258.1147a2V=(1156+95)a339.2913a3
78 Metagyrate diminished rhombicosidodecahedron File:Metagyrate diminished rhombicosidodecahedron.png 55 105 52 Cs of order 2 A=14(100+153+105+25+115(5+25))a258.1147a2V=(1156+95)a339.2913a3
79 Bigyrate diminished rhombicosidodecahedron File:Bigyrate diminished rhombicosidodecahedron.png 55 105 52 Cs of order 2 A=14(100+153+105+25+115(5+25))a258.1147a2V=(1156+95)a339.2913a3
80 Parabidiminished rhombicosidodecahedron File:Parabidiminished rhombicosidodecahedron.png 50 90 42 D5d of order 20 A=52(8+3+25+25+5(5+25))a256.9233a2V=53(11+55)a336.9672a3
81 Metabidiminished rhombicosidodecahedron File:Metabidiminished rhombicosidodecahedron.png 50 90 42 C2v of order 4 A=52(8+3+25+25+5(5+25))a256.9233a2V=53(11+55)a336.9672a3
82 Gyrate bidiminished rhombicosidodecahedron File:Gyrate bidiminished rhombicosidodecahedron.png 50 90 42 Cs of order 2 A=52(8+3+25+25+5(5+25))a256.9233a2V=53(11+55)a336.9672a3
83 Tridiminished rhombicosidodecahedron File:Tridiminished rhombicosidodecahedron.png 45 75 32 C3v of order 6 A=14(60+53+305+25+95(5+25))a255.732a2V=(352+2353)a334.6432a3
84 Snub disphenoid File:Snub disphenoid.png 8 18 12 D2d of order 8 A=33a25.1962a2V0.8595a3
85 Snub square antiprism File:Snub square antiprism.png 16 40 26 D4d of order 16 A=2(1+33)a212.3923a2V3.6012a3
86 Sphenocorona File:Sphenocorona.png 10 22 14 C2v of order 4 A=(2+33)a27.1962a2V=12a31+332+13+361.5154a3
87 Augmented sphenocorona File:Augmented sphenocorona.png 11 26 17 Cs of order 2 A=(1+43)a27.9282a2V=12a31+332+13+36+1321.7511a3
88 Sphenomegacorona File:Sphenomegacorona.png 12 28 18 C2v of order 4 A=2(1+23)a28.9282a2V1.9481a3
89 Hebesphenomegacorona File:Hebesphenomegacorona.png 14 33 21 C2v of order 4 A=32(2+33)a210.7942a2V2.9129a3
90 Disphenocingulum File:Disphenocingulum.png 16 38 24 D2d of order 8 A=(4+53)a212.6603a2V3.7776a3
91 Bilunabirotunda File:Bilunabirotunda.png 14 26 14 D2h of order 8 A=(2+23+5(5+25))a212.346a2V=112(17+95)a33.0937a3
92 Triangular hebesphenorotunda File:Triangular hebesphenorotunda.png 18 36 20 C3v of order 6 A=14(12+193+35(5+25))a216.3887a2V=(52+756)a35.1087a3

References

Bibliography

External links