One of the basic undefined terms of geometry. A plane goes on forever in all directions (in two-dimensions) and is "flat" (i.e., it has no thickness).
Planes at Mathforum.com
: Read another description of plane.
Basic Terms at Thinkquest.org
: Read more about the basic meanings of the Geometry words: equidistant, points, line, plane, collinear, coplanar, intersection, and angles.
Points, Lines and Planes
: Read more about points, lines and planes.