Geometric shape

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Geometric shape is a set of points on the plane R² closed with three or more sidess, with one curve or with combinations of them (lines, arcs, circles, elliptical arcs, ellipses, hyperbolas, elliptic curves, ...).

Some geometric shapes are:

polygon
- bicentric polygon
- concave polygon
- constructible polygon
- convex polygon
- cyclic polygon
- decagon
- dodecagon
- enneagon
- equiangular polygon
- equilateral polygon
- hendecagon
- heptagon
- hexagon
  - Lemoine hexagon
  - Tucker hexagon
- icosagon
  - swastika
- octagon
- pentagon
  - cyclic pentagon
- regular polygon
  - regular decagon
  - regular dodecagon
  - regular hendecagon
  - regular hexagon
  - regular icosagon
  - regular octagon
  - regular pentagon
- star figure
  - star of Lakshmi
- star polygon
  - decagram
  - dodecagram
  - octagram
  - heptagram
  - star of David, hexagram
  - star of Goliath, nonagram
  - pentacle, pentagram
triangle
- acute triangle
- anticomplementary triangle
- equilateral triangle
- excentral triangle, tritangent triangle
- isosceles triangle
- medial triangle, auxiliary triangle
- obtuse triangle
- rational triangle
- right triangle
  - 30-60-90 triangle
  - isosceles right triangle
- scalene triangle
- Reuleaux triangle
parallelogram
- equilateral parallelogram
  - Lozenge
- rhomboid
- Wittenbauer's parallelogram
Penrose tile
- Penrose dart
- Penrose kite
rectangle
rhombus, diamond
- Harborth's tile
square
trapezium
- isosceles trapezium
quadrilateral
- cyclic quadrilateral, tetrachord, chordal tetragon ?
  - Brahmagupta's trapezium
- equilic quadrilateral
- kite
- rational quadrilateral
- strombus
- tangential quadrilateral, tangential tetragon ?
- trapezoid
  - isosceles trapezoid
polydrafter
annulus
arbelos
circle
- Archimedes' circle
- Bankoff circle
- circumcircle
- excircle
- incircle
- nine point circle
circular sector
circular segment
lune
Reuleaux polygon
rotor
- lens, fish bladder, vesica piscis
- Reuleaux triangle
salinon
semicircle
triquetra
Yin-Yang
astroid, paracycle, cubocycloid
deltoid
ellipse
smoothed octagon
super ellipse