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Sigma KEE - OpenTwoDimensionalFigure
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OpenTwoDimensionalFigure
The class of TwoDimensionalFigures that are not ClosedTwoDimensionalFigures.
Relationships      
Parents TwoDimensionalFigure The class of GeometricFigures that have position and an extension along two dimensions, viz. plane figures like circles and polygons.
Children TwoDimensionalAngleAny two OneDimensionalFigures (i.e. straight lines) meeting at a single GeometricPoint.


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