use Debug;
use ;
/** Segment2 trait
*
* - LineSegment2 has implemented this trait except for the **source_radian**, **target_radian**, **center** and **radius**, methods.
*
* - CircleSegment2 has implemented this trait except for the **source**, **source_radian**, **target** and **target_radian** methods.
*
* - ArcSegment2 has implemented this trait.
*/