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  2. Reflection symmetry - Wikipedia

    en.wikipedia.org/wiki/Reflection_symmetry

    Triangles with reflection symmetry are isosceles. Quadrilaterals with reflection symmetry are kites, (concave) deltoids, rhombi, [2] and isosceles trapezoids.All even-sided polygons have two simple reflective forms, one with lines of reflections through vertices, and one through edges.

  3. Triangle group - Wikipedia

    en.wikipedia.org/wiki/Triangle_group

    Its symmetry group is the quotient of the spherical triangle group by the reflection through the origin (-I), which is a central element of order 2. Since the projective plane is a model of elliptic geometry , such groups are called elliptic triangle groups.

  4. Lists of uniform tilings on the sphere, plane, and hyperbolic ...

    en.wikipedia.org/wiki/Lists_of_uniform_tilings...

    Special cases are right triangles (p q 2). Uniform solutions are constructed by a single generator point with 7 positions within the fundamental triangle, the 3 corners, along the 3 edges, and the triangle interior. All vertices exist at the generator, or a reflected copy of it. Edges exist between a generator point and its image across a mirror.

  5. Symmetry (geometry) - Wikipedia

    en.wikipedia.org/wiki/Symmetry_(geometry)

    The triangles with reflection symmetry are isosceles, the quadrilaterals with this symmetry are kites and isosceles trapezoids. [11] For each line or plane of reflection, the symmetry group is isomorphic with C s (see point groups in three dimensions for more), one of the three types of order two (involutions), hence algebraically isomorphic to ...

  6. Uniform tiling - Wikipedia

    en.wikipedia.org/wiki/Uniform_tiling

    There are symmetry groups on the Euclidean plane constructed from fundamental triangles: (4 4 2), (6 3 2), and (3 3 3). Each is represented by a set of lines of reflection that divide the plane into fundamental triangles. These symmetry groups create 3 regular tilings, and 7 semiregular ones. A number of the semiregular tilings are repeated ...

  7. Hyperbolic geometry - Wikipedia

    en.wikipedia.org/wiki/Hyperbolic_geometry

    There are an infinite number of uniform tilings based on the Schwarz triangles (p q r) where 1/p + 1/q + 1/r < 1, where p, q, r are each orders of reflection symmetry at three points of the fundamental domain triangle, the symmetry group is a hyperbolic triangle group. There are also infinitely many uniform tilings that cannot be generated from ...

  8. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and a tiling is aperiodic if it does not contain arbitrarily large periodic regions or patches. However, despite their lack of translational symmetry, Penrose tilings may have both reflection symmetry and fivefold rotational symmetry.

  9. Dihedral group - Wikipedia

    en.wikipedia.org/wiki/Dihedral_group

    The lines of reflection labelled S 0, S 1, and S 2 remain fixed in space (on the page) and do not themselves move when a symmetry operation (rotation or reflection) is done on the triangle (this matters when doing compositions of symmetries). The composition of these two reflections is a rotation.