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Beeline Air Line, Axis, Chord, Cut, Cutoff, Diagonal, Diameter, Direct Line, Directrix, Edge, Great-Circle Course, Normal, Perpendicular, Radius, Radius Vector, Right Line, Secant, Segment, Shortcut, Shortest Way, Side, Straight, Straight Course, Straight Line, Straight Stretch, Straightaway, Streamline, Tangent, Transversal, Vector