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Sigma KEE - Oval

橢圓

The class of ClosedTwoDimensionalFigures that are produced by the intersection of a Cone with a ClosedTwoDimensionalFigure.

Relationships
Parents	封閉的二維圖	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.