In mathematics, plane geometry refers generally to geometry in a two-dimensional space called a plane.
- Euclidean plane geometry, is the most common meaning; it includes 
- Plane analytic geometry
 - Plane synthetic geometry
 
 - Plane projective geometry, the geometry of projective planes
 - Geometry of finite planes, such as the Fano plane
 - Affine geometry of affine planes
 - Geometry of non-Euclidean planes, including
- hyperbolic planes,
 - elliptic planes
 - two-dimensional spherical geometry.
 
 
See also
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