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Sigma KEE - Quadrilateral
KB Term: 

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quadrilateral
Any four-sided Polygon.
Relationships      
Parents polygon A ClosedTwoDimensionalFigure that is composed exclusively of straight lines, i.e. OneDimensionalFigures.
Children rectangleAny Quadrilateral whose angles are all RightAngles.


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Sigma version 3.0 is open source software produced by Articulate Software and its partners