List of two-dimensional geometric shapes
This is a list of two-dimensional geometric shapes in Euclidean and other 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
- Angle(Acute, Obtuse, Right)
- 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
- Henagon – 1 side
- Digon – 2 sides
- Triangle – 3 sides
- Acute triangle
- Equilateral triangle
- Heptagonal triangle
- Isosceles triangle
- Obtuse triangle
- Rational triangle
- Right triangle
- 30-60-90 triangle
- Isosceles right triangle
- Kepler triangle
- Scalene triangle
- Quadrilateral – 4 sides
- Pentagon – 5 sides
- Hexagon – 6 sides
- Heptagon – 7 sides
- Octagon – 8 sides
- Nonagon – 9 sides
- Decagon – 10 sides
- Hendecagon – 11 sides
- Dodecagon – 12 sides
- Tridecagon – 13 sides
- Tetradecagon – 14 sides
- Pentadecagon – 15 sides
- Hexadecagon – 16 sides
- Heptadecagon – 17 sides
- Octadecagon – 18 sides
- Enneadecagon – 19 sides
- Icosagon – 20 sides
- Swastika (example)
- Star polygon – there are multiple types of stars
- Pentagram - star polygon with 5 sides
- Hexagram – star polygon with 6 sides
- Star of David (example)
- Heptagram – star polygon with 7 sides
- Octagram – star polygon with 8 sides
- Star of Lakshmi (example)
- Decagram - star polygon with 10 sides
- Apeirogon - generalized polygon with countably infinite set of sides
Curved
Composed of circular arcs
- Annulus
- Arbelos
- Circle
- Archimedes' twin circles
- Bankoff circle
- Circumcircle
- Disc
- Incircle and excircles of a triangle
- Nine-point circle
- Circular sector
- Circular segment
- Crescent
- Lens, vesica piscis (fish bladder)
- Lune
- Quatrefoil
- Reuleaux polygon
- Salinon
- Semicircle
- Tomahawk
- Trefoil
- Triquetra
- Heart
Not composed of circular arcs
- Archimedean spiral
- Astroid
- Cardioid
- Deltoid
- Ellipse
- Heartagon
- Various lemniscates
- Oval
- Cartesian oval
- Cassini oval
- Oval of Booth
- Ovoid – similar to an oval...
- Superellipse
- Taijitu
- Tomoe
- Magatama
gollark: > hoping for more people to die and greater economic damage because it would boost your political ideology
gollark: The economic damage is almost certainly better than the increased deaths/sick people which would result from doing less.
gollark: And I'd argue that not knowing exactly what it can do means you should treat it more seriously.
gollark: It's very infectious, mortality rate between, what, 0.2% and 10%, depending (probably only 10% as an upper bound with really overloaded healthcare), and not really any good treatments yet.
gollark: We have a decent idea.
References
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