PLANE GEOMETRY

In mathematics, 'plane geometry' may mean:

★ geometry of a plane,

★ geometry of the Euclidean plane,
or sometimes

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

★ geometry of the hyperbolic plane or two-dimensional spherical geometry.
See also: plane curve.

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