Plane geometry

From Wikipedia, the free encyclopedia

In mathematics, plane geometry may mean:

• geometry of a plane,
• geometry of the Euclidean plane,

or sometimes a plane is any flat surface that extends without end in all directions.

• geometry of a projective plane, most commonly the real projective plane but possibly the complex projective plane, Fano plane or others;

• geometry of the hyperbolic plane or two-dimensional spherical geometry.

See also: plane curve.