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Sigma KEE - ClosedTwoDimensionalFigure
KB Term: 

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ClosedTwoDimensionalFigure
Any TwoDimensionalFigure which has a well defined interior and exterior.
Relationships      
Parents TwoDimensionalFigure The class of GeometricFigures that have position and an extension along two dimensions, viz. plane figures like circles and polygons.
Children CircleSectorA slice of a Circle, i.e. any ClosedTwoDimensionalFigure which consists of two Radii and the arc of the Circle that they bound.
 OvalThe class of ClosedTwoDimensionalFigures that are produced by the intersection of a Cone with a ClosedTwoDimensionalFigure.
 PolygonA ClosedTwoDimensionalFigure that is composed exclusively of straight lines, i.e. OneDimensionalFigures.


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