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Relation: subclass

direct-childrendocumentationgraph
TwoDimensionalFigure16这是有定位并在两个维度上有延伸空间的 GeometricFigure 类别，即是如圆圈和多边形的平面图。^
    OpenTwoDimensionalFigure4这是非 ClosedTwoDimensionalFigure 的 TwoDimensionalFigure 类别。^
        TwoDimensionalAngle3这是任何两个 OneDimensionalFigure(即是 直线)相遇的的单个 GeometricPoint。^

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