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Sigma KEE - OpenTwoDimensionalFigure
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开放二维图
这是非 ClosedTwoDimensionalFigureTwoDimensionalFigure 类别。
Relationships      
Parents 二维图 The class of GeometricFigures that have position and an extension along two dimensions, viz. plane figures like circles and polygons.
Children 二维角度Any two OneDimensionalFigures (i.e. straight lines) meeting at a single GeometricPoint.


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