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 Related Terms
 Intersecting Planes:  Planes that cross each other. The region where two planes cross forms one line.
Line: One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.
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).