(subclass TwoDimensionalFigure GeometricFigure) | Merge.kif 17817-17817 | 子類 二維圖 and 幾何圖 |
(subclass OpenTwoDimensionalFigure TwoDimensionalFigure) | Merge.kif 17823-17823 | 子類 開放二維圖 and 二維圖 |
(subclass ClosedTwoDimensionalFigure TwoDimensionalFigure) | Merge.kif 17831-17831 | 子類 封閉的二維圖 and 二維圖 |