Plane geometry

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In mathematics, geometry plane 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.

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