A

• Affine geometry
• Algebraic geometry

C

• Conformal geometry
• Conic sections
• Coordinate systems
• Curves

D

• Differential geometry

D

• Discrete geometry

E

• Euclidean geometry

F

• Figurate numbers
• Fractals

G

• Geometric algorithms

H

• Hyperbolic geometry

I

• Integral geometry

M

• Metric geometry

O

• Orientation

P

• Polygons
• Polyhedra
• Projective geometry
• Pythagorean philosophy

T

• Topology

2

• 2D geometric model

A

• Absolute geometry
• Affine geometry
• Algebraic geometry
• Alignments of random points
• Analytic geometry
• Arrangement of hyperplanes

B

• Barycentric coordinates
• Birational geometry
• Bisection

C

• Carathéodory's theorem (convex hull)
• Centroid
• Chirality
• Circumcircle
• Circumscribed sphere
• Codimension
• Complex geometry
• Computational geometry
• Concavity
• Concyclic
• Constructive solid geometry
• Contact geometry
• Convex
• Convex hull
• Coordinate system
• Cubing the cube
• Curve

D

• De Sitter space

D

• Descartes' theorem
• Descriptive geometry
• Digital geometry
• Dihedral angle
• Diminishing angle
• Dividing a circle into areas

E

• Elliptic geometry
• Erlangen program
• Euclid's Elements
• Euler characteristic
• Euler's rotation theorem
• Extreme point

F

• Finite geometry
• Ford circle

G

• Geometry

H

• Handedness
• Heilbronn triangle problem
• Homogeneous space
• Hyperbolic geometry

I

• Information geometry
• Inscribed sphere
• Integral geometry
• Inversive geometry
• Isometry

L

• Line (mathematics)
• List of differential geometry topics
• List of geometry topics
• Locus (mathematics)

M

• Meander (mathematics)

M

• Minkowski addition

N

• Non-Euclidean geometry

O

• Orthogonal projection

P

• Packing problem
• Parallel (geometry)
• Parallel postulate
• Point (geometry)
• Projective Hilbert space
• Projective geometry

R

• Ray (geometry)
• Real tree
• Regular Division of the Plane
• Roulette (curve)

S

• Simplex
• Spherical geometry
• Stereographic projection
• Strähle construction
• Sylvester-Gallai theorem
• Symmetry group
• Synthetic geometry
• Szemerédi-Trotter theorem

T

• Transformation geometry
• Transversal line
• Trilateration
• Tropical geometry

U

• Unit square

V

• Vertex figure