(subclass OpenTwoDimensionalFigure TwoDimensionalFigure) | Merge.kif 17823-17823 | OpenTwoDimensionalFigure e' uma sub-classe de TwoDimensionalFigure |
(subclass TwoDimensionalAngle OpenTwoDimensionalFigure) | Merge.kif 17827-17827 | TwoDimensionalAngle e' uma sub-classe de OpenTwoDimensionalFigure |