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plane
A flat (2-dimensional) surface such that a straight line joining any two points on it will also lie entirely on the surface. A plane may be determined by two intersecting parallel lines, by a line and a point that does not lie on the line, or by three points that do not lie in a straight line. The intersection of two planes is a straight line; the intersection of a plane and a line in a different plane is a point. An infinite number of planes may pass through a single point or line. A plane is parallel to another plane if all perpendiculars drawn between them are of equal length.
A plane of symmetry is a plane cutting a geometrical figure such that the parts of it lying on either side are symmetrical.
Related entries
• axis of symmetry
• symmetry
Related category
• GEOMETRY
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