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
- 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 sided
- digon — 2 sided
- triangle
- quadrilateral
- pentagon
- pentagonoid
- hexagon
- heptagon
- octagon
- nonagon
- decagon
- hendecagon
- dodecagon
- hexadecagon
- icosagon
- star without crossing lines
- star polygon
Curved
Composed of circular arcs
- annulus
- arbelos
- circle
- circular sector
- circular segment
- crescent
- Indalo
- lens, vesica piscis (fish bladder)
- lune
- Reuleaux polygon
- salinon
- semicircle
- tomahawk
- triquetra
Not composed of circular arcs
- Archimedean spiral
- astroid
- cardioid
- deltoid
- ellipse
- heart (geometry)
- heartagon
- various lemniscates
- oval
- ovoid (shape)
- superellipse
- taijitu
- tomoe, magatama