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Sigma KEE - ThreeDimensionalFigure
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三维图
这是有定位和在三个维度上都有延伸空间的 GeometricFigure 类别，即是如多面体和圆柱体的几何固体。
Relationships      
Parents 几何图 The class of all geometric figures, i.e. the class of all abstract, spatial representations. The instances of this class are GeometricPoints, TwoDimensionalFigures or ThreeDimensionalFigures.
Children 锥体The class of ThreeDimensionalFigures which are produced by rotating a RightTriangle around its RightAngle.
 圆筒The class of ThreeDimensionalFigures such that all GeometricPoints that make up the Cylinder are equidistant from a OneDimensionalFigure, known as the axis of the Cylinder.
 HemisphereFigureHemisphereFigure describes a figure that is half of a Sphere
 球The class of ThreeDimensionalFigures such that all GeometricPoints that make up the Sphere are equidistant from a single GeometricPoint, known as the center of the Sphere.


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