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26 bytes added ,  16:17, April 5, 2011
clarification
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[[Line]]s or [[surface]]s are '''perpendicular''' if they are at [[right angle]]s to one another.  The mathematical opposite is [[parallel]].
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[[Line]]s or [[surface]]s are '''perpendicular''' if they are at [[right angle]]s to one another.  In two-dimensional space, the mathematical opposite is [[parallel]].
    
[[category:Plane Geometry]]
 
[[category:Plane Geometry]]
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