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Sigma KEE - TwoDimensionalAngle
KB Term: 

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
二维角度
这是任何两个 OneDimensionalFigure(即是 直线)相遇的的单个 GeometricPoint
Relationships      
Parents 开放二维图 The class of TwoDimensionalFigures that are not ClosedTwoDimensionalFigures.


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