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 Related Terms
 Plane:  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).
Dimensions: The measure of the magnitude or size of an object.
Intersecting Planes: Planes that cross each other. The region where two planes cross forms one line.
Point: One of the basic undefined terms of geometry. A point has no length, width, or thickness, and we often use a dot to represent it.
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
Half-plane: The portion of a plane on one side of a line extending on the plane.