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Four circles may be drawn through an arbitrary point P on a torus. The first two circles are obvious: one is in the plane of the torus and the second perpendicular to it. The ...

In plane geometry, a chord is the line segment joining two points on a curve. The term is often used to describe a line segment whose ends lie on a circle. The term is also ...

A polygon whose vertices do not all lie in a plane.

A finite geometry is a geometry with a finite number of points. When confined to a plane, all finite geometries are either projective plane geometries (with no parallel ...

A quadrilateral tiling is a tiling of the plane by identical quadrilaterals. Any nonself-intersecting quadrilateral (Wells 1991, p. 208) tiles the plane, as illustrated above.

A set of plane measure 0 that contains a circle of every radius.

The square torus is the quotient of the plane by the integer lattice.

A section of a graph obtained by finding its intersection with a plane.

A plane figure for which quadrature is possible is said to be quadrable.

A method for mapping three-dimensional figures onto the plane.