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A model fo of this concept must provide:
| SphericalKernel::Circular_arc_point_3 | ||
| fo ( SphericalKernel::Circular_arc_3 a ) | ||
| Constructs the source vertex of a. | ||
| SphericalKernel::Circular_arc_point_3 | ||
| fo ( SphericalKernel::Line_arc_3 l ) | ||
| Same, for a line segment. | ||