(subclass OpenTwoDimensionalFigure TwoDimensionalFigure) | Merge.kif 17880-17880 | OpenTwoDimensionalFigure e' uma sub-classe de TwoDimensionalFigure |
(subclass TwoDimensionalAngle OpenTwoDimensionalFigure) | Merge.kif 17884-17884 | TwoDimensionalAngle e' uma sub-classe de OpenTwoDimensionalFigure |