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Sigma KEE - OpenTwoDimensionalFigure
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開放二維圖
The class of TwoDimensionalFigures that are not ClosedTwoDimensionalFigures.
Relationships      
Parents 二維圖 The class of GeometricFigures that have position and an extension along two dimensions, viz. plane figures like circles and polygons.
Children 二維角度Any two OneDimensionalFigures (i.e. straight lines) meeting at a single GeometricPoint.


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