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List of two-dimensional geometric shapes
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{{Short description|none}} This is a list of [[two-dimensional]] [[geometric shape]]s in [[Euclidean geometry|Euclidean]] and other [[geometry|geometries]]. For mathematical objects in more dimensions, see [[list of mathematical shapes]]. For a broader scope, see [[list of shapes]]. ==Generally composed of straight line segments== {{main|Polygon}} * [[Angle]] * [[Balbis]] * [[Concave polygon]] * [[Constructible polygon]] * [[Convex polygon]] * [[Cyclic polygon]] * [[Equiangular polygon]] * [[Equilateral polygon]] * [[Penrose tile]] * [[Polyform]] * [[Regular polygon]] * [[Simple polygon]] * [[Tangential polygon]] ===Polygons with specific numbers of sides=== * [[Triangle]] β 3 sides ** [[Acute triangle]] ** [[Equilateral triangle]] ** [[Heptagonal triangle]] ** [[Isosceles triangle]] *** [[Golden triangle (mathematics)|Golden Triangle]] ** [[Obtuse triangle]] ** [[Rational triangle]] ** [[Heronian triangle]] *** [[Pythagorean triangle]] *** Isosceles heronian triangle *** Primitive Heronian triangle ** [[Right triangle]] *** [[30-60-90 triangle]] *** [[Isosceles right triangle]] *** [[Kepler triangle]] ** [[Scalene triangle]] * [[Quadrilateral]] β 4 sides **[[Cyclic quadrilateral]] ** [[Kite (geometry)|Kite]] *** [[Rectangle]] *** [[Rhomboid]] *** [[Rhombus]] *** [[Square (geometry)|Square]] (regular quadrilateral) ** [[Tangential quadrilateral]] ** [[Trapezoid]] *** [[Isosceles trapezoid]] ** [[Trapezus (geometry)|Trapezus]] * [[Pentagon]] β 5 sides * [[Hexagon]] β 6 sides ** [[Lemoine hexagon]] * [[Heptagon]] β 7 sides * [[Octagon]] β 8 sides * [[Nonagon]] β 9 sides * [[Decagon]] β 10 sides * [[Hendecagon]] β 11 sides * [[Dodecagon]] β 12 sides * [[Tridecagon]] β 13 sides * [[Tetradecagon]] β 14 sides * [[Pentadecagon]] β 15 sides * [[Hexadecagon]] β 16 sides * [[Heptadecagon]] β 17 sides * [[Octadecagon]] β 18 sides * [[Enneadecagon]] β 19 sides * [[Icosagon]] β 20 sides * [[Icosikaihenagon]] - 21 sides * [[Icosikaidigon]] - 22 sides * [[Icositrigon]] - 23 sides * [[Icositetragon]] - 24 sides * [[Icosikaipentagon]] - 25 sides * [[Icosikaihexagon]] - 26 sides * [[Icosikaiheptagon]] - 27 sides * [[Icosikaioctagon]] - 28 sides * [[Icosikaienneagon]] - 29 sides * [[Triacontagon]] - 30 sides * [[Tetracontagon]] - 40 sides * [[Pentacontagon]] - 50 sides * [[Hexacontagon]] - 60 sides * [[Heptacontagon]] - 70 sides * [[Octacontagon]] - 80 sides * [[Enneacontagon]] - 90 sides * [[Hectogon]] - 100 sides * [[Dihectogon]] - 200 sides * [[Trihectogon]] - 300 sides * [[Tetrahectogon]] - 400 sides * [[Pentahectogon]] - 500 sides * [[Hexahectogon]] - 600 sides * [[Heptahectogon]] - 700 sides * [[Octahectogon]] - 800 sides * [[Enneahectogon]] - 900 sides * [[Chiliagon]] - 1,000 sides * [[Myriagon]] - 10,000 sides * [[Megagon]] - 1,000,000 sides * [[Star polygon]] β there are multiple types of stars ** [[Pentagram]] - star polygon with 5 sides ** [[Hexagram]] β star polygon with 6 sides *** [[Star of David]] (example) ** [[Heptagram]] β star polygon with 7 sides ** [[Octagram]] β star polygon with 8 sides *** [[Star of Lakshmi]] (example) ** [[Enneagram (geometry)|Enneagram]] - star polygon with 9 sides ** [[Decagram (geometry)|Decagram]] - star polygon with 10 sides ** [[Hendecagram]] - star polygon with 11 sides ** [[Dodecagram]] - star polygon with 12 sides * [[Apeirogon]] - generalized polygon with countably infinite set of sides ==Curved== {{main|List of curves}} ===Composed of circular arcs=== * [[annulus (mathematics)|Annulus]] * [[Arbelos]] * [[Circle]] ** [[Archimedes' twin circles]] ** [[Bankoff circle]] ** [[Circular triangle]] *** [[Reuleaux triangle]] ** [[Circumcircle]] ** [[disc (mathematics)|Disc]] ** [[Incircle and excircles of a triangle]] ** [[Nine-point circle]] * [[Circular sector]] * [[Circular segment]] * [[Crescent]] * [[lens (geometry)|Lens]], [[vesica piscis]] (fish bladder) * [[Lune (mathematics)|Lune]] * [[Quatrefoil]] * [[Reuleaux polygon]] ** [[Reuleaux triangle]] * [[Salinon]] * [[Semicircle]] * [[tomahawk (geometric shape)|Tomahawk]] * [[Trefoil]] * [[Triquetra]] ===Not composed of circular arcs=== * [[Archimedean spiral]] * [[Astroid]] * [[Cardioid]] * [[deltoid curve|Deltoid]] * [[Ellipse]] * Various [[lemniscate]]s * [[Oval (geometry)|Oval]] ** [[Cartesian oval]] ** [[Cassini oval]] ** [[Oval of Booth]] * [[Superellipse]] * [[Taijitu]] * [[Tomoe]] * [[Magatama]] ==See also== *[[List of triangle topics]] *[[List of circle topics]] *[[Glossary of shapes with metaphorical names]] ==References== {{Reflist}} [[Category:Geometric shapes|2]] [[Category:Lists of shapes|two-dimensional]] [[ar:ΩΨ§Ψ¦Ω Ψ© Ψ§ΩΨ£Ψ΄ΩΨ§Ω Ψ§ΩΩΩΨ―Ψ³ΩΨ©]] [[it:Elenco strutturato di forme geometriche]] [[sv:Geometrisk figur]]
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