六角形の、六方晶系の

関: hexagon、hexagonal system

WordNet

a six-sided polygon

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六角形の,六辺形の
六角形,六辺形

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2019/06/19 03:25:10」(JST)

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In geometry, a hexagon (from Greek ἕξ hex, "six" and γωνία, gonía, "corner, angle") is a six-sided polygon or 6-gon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°.

1 Regular hexagon
- 1.1 Parameters
2 Symmetry
- 2.1 A2 and G2 groups
3 Dissection
4 Related polygons and tilings
5 Hexagonal structures
6 Tesselations by hexagons
7 Hexagon inscribed in a conic section
- 7.1 Cyclic hexagon
8 Hexagon tangential to a conic section
9 Equilateral triangles on the sides of an arbitrary hexagon
10 Skew hexagon
- 10.1 Petrie polygons
11 Convex equilateral hexagon
- 11.1 Polyhedra with hexagons
12 Gallery of natural and artificial hexagons
13 See also
14 References
15 External links

Regular hexagon

A regular hexagon has Schläfli symbol {6}^[1] and can also be constructed as a truncated equilateral triangle, t{3}, which alternates two types of edges.

A step-by-step animation of the construction of a regular hexagon using compass and straightedge, given by Euclid's Elements, Book IV, Proposition 15: this is possible as 6

=

2 × 3, a product of a power of two and distinct Fermat primes.

When the side length AB is given, then you draw around the point A and around the point B a circular arc. The intersection M is the center of the circumscribed circle. Transfer the line segment AB four times on the circumscribed circle and connect the corner points.

A regular hexagon is defined as a hexagon that is both equilateral and equiangular. It is bicentric, meaning that it is both cyclic (has a circumscribed circle) and tangential (has an inscribed circle).

The common length of the sides equals the radius of the circumscribed circle or circumcircle, which equals ${\tfrac {2}{\sqrt {3}}}$

 
   
     
       
         
           
             2
             
               3
             
           
         
       
     
   
   {\displaystyle {\tfrac {2}{\sqrt {3}}}}

times the apothem (radius of the inscribed circle). All internal angles are 120 degrees. A regular hexagon has 6 rotational symmetries (rotational symmetry of order six) and 6 reflection symmetries (six lines of symmetry), making up the dihedral group D₆. The longest diagonals of a regular hexagon, connecting diametrically opposite vertices, are twice the length of one side. From this it can be seen that a triangle with a vertex at the center of the regular hexagon and sharing one side with the hexagon is equilateral, and that the regular hexagon can be partitioned into six equilateral triangles.

Like squares and equilateral triangles, regular hexagons fit together without any gaps to tile the plane (three hexagons meeting at every vertex), and so are useful for constructing tessellations. The cells of a beehive honeycomb are hexagonal for this reason and because the shape makes efficient use of space and building materials. The Voronoi diagram of a regular triangular lattice is the honeycomb tessellation of hexagons. It is not usually considered a triambus, although it is equilateral.

Parameters

The maximal diameter (which corresponds to the long diagonal of the hexagon), D, is twice the maximal radius or circumradius, R, which equals the side length, t. The minimal diameter or the diameter of the inscribed circle (separation of parallel sides, flat-to-flat distance, short diagonal or height when resting on a flat base), d, is twice the minimal radius or inradius, r. The maxima and minima are related by the same factor:

{\frac {1}{2}}d=r=\cos(30^{\circ })R={\frac {\sqrt {3}}{2}}R={\frac {\sqrt {3}}{2}}t

and, similarly,

d={\frac {\sqrt {3}}{2}}D.

The area of a regular hexagon

{\begin{aligned}A&={\frac {3{\sqrt {3}}}{2}}R^{2}=3Rr=2{\sqrt {3}}r^{2}\\&={\frac {3{\sqrt {3}}}{8}}D^{2}={\frac {3}{4}}Dd={\frac {\sqrt {3}}{2}}d^{2}\\&\approx 2.598R^{2}\approx 3.464r^{2}\\&\approx 0.6495D^{2}\approx 0.866d^{2}.\end{aligned}}

For any regular polygon, the area can also be expressed in terms of the apothem a and the perimeter p. For the regular hexagon these are given by a = r, and p ${}=6R=4r{\sqrt {3}}$ , so

{\begin{aligned}A&={\frac {ap}{2}}\\&={\frac {r\cdot 4r{\sqrt {3}}}{2}}=2r^{2}{\sqrt {3}}\\&\approx 3.464r^{2}.\end{aligned}}

The regular hexagon fills the fraction ${\tfrac {3{\sqrt {3}}}{2\pi }}\approx 0.8270$ of its circumscribed circle.

If a regular hexagon has successive vertices A, B, C, D, E, F and if P is any point on the circumcircle between B and C, then PE + PF = PA + PB + PC + PD.

Symmetry

The six lines of reflection of a regular hexagon, with Dih₆ or r12 symmetry, order 12.

The dihedral symmetries are divided depending on whether they pass through vertices (d for diagonal) or edges (p for perpendiculars) Cyclic symmetries in the middle column are labeled as g for their central gyration orders. Full symmetry of the regular form is r12 and no symmetry is labeled a1.

The regular hexagon has Dih₆ symmetry, order 12. There are 3 dihedral subgroups: Dih₃, Dih₂, and Dih₁, and 4 cyclic subgroups: Z₆, Z₃, Z₂, and Z₁.

These symmetries express 9 distinct symmetries of a regular hexagon. John Conway labels these by a letter and group order.^[2] r12 is full symmetry, and a1 is no symmetry. p6, an isogonal hexagon constructed by three mirrors can alternate long and short edges, and d6, an isotoxal hexagon constructed with equal edge lengths, but vertices alternating two different internal angles. These two forms are duals of each other and have half the symmetry order of the regular hexagon. The i4 forms are regular hexagons flattened or stretched along one symmetry direction. It can be seen as an elongated rhombus, while d2 and p2 can be seen as horizontally and vertically elongated kites. g2 hexagons, with opposite sides parallel are also called hexagonal parallelogons.

Each subgroup symmetry allows one or more degrees of freedom for irregular forms. Only the g6 subgroup has no degrees of freedom but can seen as directed edges.

Example hexagons by symmetry

d6 isotoxal	g6 directed	p6 isogonal		d2	g2 general parallelogon	p2
	r12 regular				i4
	g3				a1

Hexagons of symmetry g2, i4, and r12, as parallelogons can tessellate the Euclidean plane by translation. Other hexagon shapes can tile the plane with different orientations.

p6m (*632)	cmm (2*22)	p2 (2222)	p31m (3*3)	pmg (22*)		pg (××)
r12	i4	g2	d2	d2	p2	a1

A2 and G2 groups

A2 group roots	G2 group roots

The 6 roots of the simple Lie group A2, represented by a Dynkin diagram , are in a regular hexagonal pattern. The two simple roots have a 120° angle between them.

The 12 roots of the Exceptional Lie group G2, represented by a Dynkin diagram are also in a hexagonal pattern. The two simple roots of two lengths have a 150° angle between them.

Dissection

6-cube projection	10 rhomb dissection

Coxeter states that every zonogon (a 2m-gon whose opposite sides are parallel and of equal length) can be dissected into m(m-1)/2 parallelograms.^[3] In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. This decomposition of a regular hexagon is based on a Petrie polygon projection of a cube, with 3 of 6 square faces. Other parallelogons and projective directions of the cube are dissected within rectangular cuboids.

Dissection of hexagons into 3 rhombs and parallelograms
2D	Rhombs	Parallelograms

	Regular {6}	Hexagonal parallelogons
3D	Square faces		Rectangular faces

	Cube		Rectangular cuboid

Related polygons and tilings

A regular hexagon has Schläfli symbol {6}. A regular hexagon is a part of the regular hexagonal tiling, {6,3}, with 3 hexagonal around each vertex.

A regular hexagon can also be created as a truncated equilateral triangle, with Schläfli symbol t{3}. Seen with two types (colors) of edges, this form only has D₃ symmetry.

A truncated hexagon, t{6}, is a dodecagon, {12}, alternating 2 types (colors) of edges. An alternated hexagon, h{6}, is a equilateral triangle, {3}. A regular hexagon can be stellated with equilateral triangles on its edges, creating a hexagram. A regular hexagon can be dissected into 6 equilateral triangles by adding a center point. This pattern repeats within the regular triangular tiling.

A regular hexagon can be extended into a regular dodecagon by adding alternating squares and equilateral triangles around it. This pattern repeats within the rhombitrihexagonal tiling.

Regular {6}	Truncated t{3} = {6}	Hypertruncated triangles			Stellated Star figure 2{3}	Truncated t{6} = {12}	Alternated h{6} = {3}

A concave hexagon	A self-intersecting hexagon (star polygon)	Dissected {6}	Extended Central {6} in {12}	A skew hexagon, within cube

Hexagonal structures

Giant's Causeway closeup

From bees' honeycombs to the Giant's Causeway, hexagonal patterns are prevalent in nature due to their efficiency. In a hexagonal grid each line is as short as it can possibly be if a large area is to be filled with the fewest number of hexagons. This means that honeycombs require less wax to construct and gain lots of strength under compression.

Irregular hexagons with parallel opposite edges are called parallelogons and can also tile the plane by translation. In three dimensions, hexagonal prisms with parallel opposite faces are called parallelohedrons and these can tessellate 3-space by translation.

Hexagonal prism tessellations
Form	Hexagonal tiling	Hexagonal prismatic honeycomb
Regular
Parallelogonal

Tesselations by hexagons

In addition to the regular hexagon, which determines a unique tessellation of the plane, any irregular hexagon which satisfies the Conway criterion will tile the plane.

Hexagon inscribed in a conic section

Pascal's theorem (also known as the "Hexagrammum Mysticum Theorem") states that if an arbitrary hexagon is inscribed in any conic section, and pairs of opposite sides are extended until they meet, the three intersection points will lie on a straight line, the "Pascal line" of that configuration.

Cyclic hexagon

The Lemoine hexagon is a cyclic hexagon (one inscribed in a circle) with vertices given by the six intersections of the edges of a triangle and the three lines that are parallel to the edges that pass through its symmedian point.

If the successive sides of a cyclic hexagon are a, b, c, d, e, f, then the three main diagonals intersect in a single point if and only if ace = bdf.^[4]

If, for each side of a cyclic hexagon, the adjacent sides are extended to their intersection, forming a triangle exterior to the given side, then the segments connecting the circumcenters of opposite triangles are concurrent.^[5]

If a hexagon has vertices on the circumcircle of an acute triangle at the six points (including three triangle vertices) where the extended altitudes of the triangle meet the circumcircle, then the area of the hexagon is twice the area of the triangle.^[6]^{:p. 179}

Hexagon tangential to a conic section

Let ABCDEF be a hexagon formed by six tangent lines of a conic section. Then Brianchon's theorem states that the three main diagonals AD, BE, and CF intersect at a single point.

In a hexagon that is tangential to a circle and that has consecutive sides a, b, c, d, e, and f,^[7]

a+c+e=b+d+f.

Equilateral triangles on the sides of an arbitrary hexagon

If an equilateral triangle is constructed externally on each side of any hexagon, then the midpoints of the segments connecting the centroids of opposite triangles form another equilateral triangle.^[8]^{:Thm. 1}

Skew hexagon

A regular skew hexagon seen as edges (black) of a triangular antiprism, symmetry D_3d, [2⁺,6], (2*3), order 12.

A skew hexagon is a skew polygon with 6 vertices and edges but not existing on the same plane. The interior of such an hexagon is not generally defined. A skew zig-zag hexagon has vertices alternating between two parallel planes.

A regular skew hexagon is vertex-transitive with equal edge lengths. In 3-dimensions it will be a zig-zag skew hexagon and can be seen in the vertices and side edges of a triangular antiprism with the same D_3d, [2⁺,6] symmetry, order 12.

The cube and octahedron (same as triangular antiprism) have regular skew hexagons as petrie polygons.

Skew hexagons on 3-fold axes
Cube	Octahedron

Petrie polygons

The regular skew hexagon is the Petrie polygon for these higher dimensional regular, uniform and dual polyhedra and polytopes, shown in these skew orthogonal projections:

4D		5D
3-3 duoprism	3-3 duopyramid	5-simplex

Convex equilateral hexagon

A principal diagonal of a hexagon is a diagonal which divides the hexagon into quadrilaterals. In any convex equilateral hexagon (one with all sides equal) with common side a, there exists^[9]^{:p.184,#286.3} a principal diagonal d₁ such that

{\frac {d_{1}}{a}}\leq 2

and a principal diagonal d₂ such that

{\frac {d_{2}}{a}}>{\sqrt {3}}.

Polyhedra with hexagons

There is no Platonic solid made of only regular hexagons, because the hexagons tessellate, not allowing the result to "fold up". The Archimedean solids with some hexagonal faces are the truncated tetrahedron, truncated octahedron, truncated icosahedron (of soccer ball and fullerene fame), truncated cuboctahedron and the truncated icosidodecahedron. These hexagons can be considered truncated triangles, with Coxeter diagrams of the form and .

Hexagons in Archimedean solids
Tetrahedral	Octahedral		Icosahedral

truncated tetrahedron	truncated octahedron	truncated cuboctahedron	truncated icosahedron	truncated icosidodecahedron

There are other symmetry polyhedra with stretched or flattened hexagons, like these Goldberg polyhedron G(2,0):

Hexagons in Goldberg polyhedra
Tetrahedral	Octahedral	Icosahedral
Chamfered tetrahedron	Chamfered cube	Chamfered dodecahedron

There are also 9 Johnson solids with regular hexagons:

Johnson solids and near-misses with hexagons
triangular cupola	elongated triangular cupola	gyroelongated triangular cupola
augmented hexagonal prism	parabiaugmented hexagonal prism	metabiaugmented hexagonal prism	triaugmented hexagonal prism
augmented truncated tetrahedron	triangular hebesphenorotunda	Truncated triakis tetrahedron

Prismoids with hexagons
Hexagonal prism	Hexagonal antiprism	Hexagonal pyramid

Tilings with regular hexagons
Regular	1-uniform
{6,3}	r{6,3}	rr{6,3}	tr{6,3}

2-uniform tilings

Gallery of natural and artificial hexagons

The ideal crystalline structure of graphene is a hexagonal grid.
Assembled E-ELT mirror segments
A beehive honeycomb
The scutes of a turtle's carapace
Saturn's hexagon, a hexagonal cloud pattern around the north pole of the planet
Micrograph of a snowflake
Benzene, the simplest aromatic compound with hexagonal shape.
Hexagonal order of bubbles in a foam.
Crystal structure of a molecular hexagon composed of hexagonal aromatic rings.
Naturally formed basalt columns from Giant's Causeway in Northern Ireland; large masses must cool slowly to form a polygonal fracture pattern
An aerial view of Fort Jefferson in Dry Tortugas National Park
The James Webb Space Telescope mirror is composed of 18 hexagonal segments.
Metropolitan France has a vaguely hexagonal shape. In French, l'Hexagone refers to the European mainland of France.
Hexagonal Hanksite crystal, one of many hexagonal crystal system minerals
Hexagonal barn
The Hexagon, a hexagonal theatre in Reading, Berkshire
Władysław Gliński's hexagonal chess
Pavilion in the Taiwan Botanical Gardens
Hexagonal window

References

^ Wenninger, Magnus J. (1974), Polyhedron Models, Cambridge University Press, p. 9, ISBN 9780521098595.
^ John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, (2008) The Symmetries of Things, ISBN 978-1-56881-220-5 (Chapter 20, Generalized Schaefli symbols, Types of symmetry of a polygon pp. 275-278)
^ Coxeter, Mathematical recreations and Essays, Thirteenth edition, p.141
^ Cartensen, Jens, "About hexagons", Mathematical Spectrum 33(2) (2000–2001), 37–40.
^ Dergiades, Nikolaos (2014). "Dao's theorem on six circumcenters associated with a cyclic hexagon". Forum Geometricorum. 14: 243–246.
^ Johnson, Roger A., Advanced Euclidean Geometry, Dover Publications, 2007 (orig. 1960).
^ Gutierrez, Antonio, "Hexagon, Inscribed Circle, Tangent, Semiperimeter", [1], Accessed 2012-04-17.
^ Dao Thanh Oai (2015). "Equilateral triangles and Kiepert perspectors in complex numbers". Forum Geometricorum. 15: 105–114.
^ Inequalities proposed in “Crux Mathematicorum”, [2].

External links

Weisstein, Eric W. "Hexagon". MathWorld.

Definition and properties of a hexagon with interactive animation and construction with compass and straightedge.
An Introduction to Hexagonal Geometry on Hexnet a website devoted to hexagon mathematics.
Cymatics – Hexagonal shapes occurring within water sound images^{[dead link]}
Cassini Images Bizarre Hexagon on Saturn
Saturn's Strange Hexagon
A hexagonal feature around Saturn's North Pole
"Bizarre Hexagon Spotted on Saturn" – from Space.com (27 March 2007)

v t e Fundamental convex regular and uniform polytopes in dimensions 2–10
Family	A_n	B_n	I₂(p) / D_n	E₆ / E₇ / E₈ / F₄ / G₂	H_n
Regular polygon	Triangle	Square	p-gon	Hexagon	Pentagon
Uniform polyhedron	Tetrahedron	Octahedron • Cube	Demicube		Dodecahedron • Icosahedron
Uniform 4-polytope	5-cell	16-cell • Tesseract	Demitesseract	24-cell	120-cell • 600-cell
Uniform 5-polytope	5-simplex	5-orthoplex • 5-cube	5-demicube
Uniform 6-polytope	6-simplex	6-orthoplex • 6-cube	6-demicube	1₂₂ • 2₂₁
Uniform 7-polytope	7-simplex	7-orthoplex • 7-cube	7-demicube	1₃₂ • 2₃₁ • 3₂₁
Uniform 8-polytope	8-simplex	8-orthoplex • 8-cube	8-demicube	1₄₂ • 2₄₁ • 4₂₁
Uniform 9-polytope	9-simplex	9-orthoplex • 9-cube	9-demicube
Uniform 10-polytope	10-simplex	10-orthoplex • 10-cube	10-demicube
Uniform n-polytope	n-simplex	n-orthoplex • n-cube	n-demicube	1_k2 • 2_k1 • k₂₁	n-pentagonal polytope
Topics: Polytope families • Regular polytope • List of regular polytopes and compounds

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「六方晶系」

Regular hexagon
	A regular hexagon
Type	Regular polygon
Edges and vertices	6
Schläfli symbol	{6}, t{3}
Coxeter diagram	;
Symmetry group	Dihedral (D6), order 2×6
Internal angle (degrees)	120°
Dual polygon	Self
Properties	Convex, cyclic, equilateral, isogonal, isotoxal

　　[★]

英: hexagonal system、hexagonal
関: 六角形

「六角形」

　　[★]

英: hexagon、hexagonal
関: 六方晶系

「hexagonal system」

　　[★]

六方晶系

関: hexagonal

「hexagon」

　　[★]

六角形

関: hexagonal

[1] Wenninger, Magnus J. (1974), Polyhedron Models, Cambridge University Press, p. 9, ISBN 9780521098595.

[2] John H. Conway, Heidi Burgiel, Chaim Goodman-Strauss, (2008) The Symmetries of Things, ISBN 978-1-56881-220-5 (Chapter 20, Generalized Schaefli symbols, Types of symmetry of a polygon pp. 275-278)

[3] Coxeter, Mathematical recreations and Essays, Thirteenth edition, p.141

[4] Cartensen, Jens, "About hexagons", Mathematical Spectrum 33(2) (2000–2001), 37–40.

[5] Dergiades, Nikolaos (2014). "Dao's theorem on six circumcenters associated with a cyclic hexagon". Forum Geometricorum. 14: 243–246.

[Johnson-6] Johnson, Roger A., Advanced Euclidean Geometry, Dover Publications, 2007 (orig. 1960).

[7] Gutierrez, Antonio, "Hexagon, Inscribed Circle, Tangent, Semiperimeter", [1], Accessed 2012-04-17.

[8] Dao Thanh Oai (2015). "Equilateral triangles and Kiepert perspectors in complex numbers". Forum Geometricorum. 15: 105–114.

[Crux-9] Inequalities proposed in “Crux Mathematicorum”, [2].

v t e Polygons (List)
1–10 sides	Monogon Digon Triangle Equilateral Isosceles Right Acute/Obtuse Quadrilateral Square Rectangle Rhombus Parallelogram Trapezoid Isosceles trapezoid Kite Pentagon Hexagon Heptagon Octagon Nonagon (Enneagon) Decagon
11–20 sides	Hendecagon Dodecagon Tridecagon Tetradecagon Pentadecagon Hexadecagon Heptadecagon Octadecagon Enneadecagon Icosagon
21–100 sides (selected)	Icosidigon (22) Icositetragon (24) Icosihexagon (26) Icosioctagon (28) Triacontagon (30) Triacontadigon (32) Triacontatetragon (34) Tetracontagon (40) Tetracontadigon (42) Tetracontaoctagon (48) Pentacontagon (50) Hexacontagon (60) Hexacontatetragon (64) Heptacontagon (70) Octacontagon (80) Enneacontagon (90) Enneacontahexagon (96) Hectogon (100)
>100 sides	120-gon 257-gon 360-gon Chiliagon (1000) Myriagon (10000) 65537-gon Megagon (1000000) Apeirogon (∞)
Star polygons (5–12 sides)	Pentagram Hexagram Heptagram Octagram Enneagram Decagram Hendecagram Dodecagram
Others	Pseudogon Skew polygon Skew apeirogon
Classes	Concave Convex Cyclic Equiangular Equilateral Isogonal Isotoxal Regular Simple Tangential

リンク元	「六方晶系」「六角形」
拡張検索	「hexagonal system」
関連記事	「hexagon」

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案内

hexagonal