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Sigma KEE - Oval

椭圆

这是 ClosedTwoDimensionalFigure 的类别，它是由一个 Cone 和 ClosedTwoDimensionalFigure 相交所产生的。

Relationships
Parents	封闭的二维图	Any TwoDimensionalFigure which has a well defined interior and exterior.
Children	圈	The class of Ovals such that all GeometricPoints that make up the Circle are equidistant from a single GeometricPoint, known as the center of the Circle.